1. Full name: Hoang Thi Nhung                                                               2. Sex: Female

3. Date of birth: 10-9-1975                                                                     4. Place of birth: Hà Nội

5. Admission decision number: 2999/2013/QĐ-XHNV-SĐH, Dated 30/12/2013, by VNU President.

6. Changes in academic process:  None

7. Official thesis title: On the Definition in the dictionaries for primary school students.

8. Major: Vietnamese linguistics.  9. Code: 62 22 01 02.

10. Supervisors:            1. Prof. Sc.D Lý Toàn Thắng

                                    2. Assoc. Prof. Ph.D. Phạm Hùng Việt

11. Summary of the new findings of the thesis: The overview of studies related to the subject shows that the definition of children's dictionaries have had many achievements. The works mentioned some problems such as the necessity or not of the definition, definition methods in children's dictionaries, explanations of word meaning and the semantic acquisition of children. In Vietnam, there are only some works dealing with the explanations of word meaning for children from the perspective of didactics. The number of works on definition methods in children's dictionaries, on explanations of word meaning and on the semantic acquisition of children is quite limited.

This thesis also studied on theories of word meaning, on traditional lexicography, systematic lexicography, cognitive lexicography, and on cognitive theories of word meaning of children, on which we considered the related questions.

This thesis examined the similarities and differences in method and content of definitions in two children's dictionaries and one adults' dictionary. The results showed that, in the children's dictionaries, the authors still used the traditional definitions. On the content of definitions, we can see three cases: 1) the same, 2) the number of meanings is smaller than that of adults' dictionaries; 3) the number of meanings is the same but the number of sememes is different.

The survey of students' explanations showed that students have used 12 models of definition. Some explanations are used in all the parts of speech: explanation by describing situations, explanation with examples, explanation by giving the function of words, explanation by the part of speech. Survey results also showed that the children are facing to many difficulties in understanding the word meanings.

Based on the resulting analysis, the thesis has suggested some definition principles and definition patterns for children from the lexicographic theory.

12. Practical applicability:

The thesis has contributed to the lexicographic theory in the definition for children in Vietnam.

The thesis has contributed to didactics in the cognitive abilities of children on word meanings.

The proposition of definition principles and definition patterns will help preparing the the theoritical and practical basis of compiling Vietnamese dictionaries for primary school students.

13. Further research directions:

Compile “Vietnamese dictionary for primary school students” that is used to learn Vietnamese as a L1.

Rechearch and compile “Vietnamese dictionary for primary school students” that is used to learn Vietnamese as a L2.

Rechearch semantic acquisition of primary school students.

14. Thesis-related publications:

1. Hoang Thi Nhung (2015), "The definition of formal words in the explanatory dictionary for primary school students," Lexicography & encyclopedia (6), pp.48-55.

2. Hoang Thi Nhung (2015), "Primary school students' ability in understanding and explaining formal words ", Journal of Social Sciences Manpower (11), pp.88-89.

3. Hoang Thi Nhung (2015), "On the definition of the modal particles in the explanatory dictionary for primary school students", Proceedings of National Conference on Linguistics 2015, University of Saigon - Vietnam Linguistics Association, Hanoi National University Publisher, H., pp. 244-250.

4. Hoang Thi Nhung (2015), "Traditional cultural knowledge through examples of Vietnamese dictionaries for primary school students", in Proceedings of National Conference on "Vietnamese study, aspects of traditional culture", T.1, Hong Bang International University - Vietnam Institute of Lexicography and Encyclopedia, Social Sciences Publishing House, H., pp.1040-1047.

5. Hoang Thi Nhung (2016), "Explaining nouns of primary school students", in Proceedings of National Conference on "Maintaining Standard Vietnamese and Teaching Language in the school", T.2, Quang Binh University- Vietnam Linguistics Association - Institute of Linguistics, Dan Tri Publishing House, pp. 1415-1422