Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
cong thai » cong hai, hong thai, cong thanh
dung cong » dung trong
cong luan » tong luan, cong tuan, dong luan
thai lua » thai luan, thai luat, thai cua
lua dung » qua dung, luan hung, qua duong
van tan » van tuan, van ban, van tai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) OR (chieu tinh)) - cong thai lua dung cong luan van tan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chieu tinh)) - cong thai lua dung cong luan van tan".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chieu tinh)) - cong thai lua dung cong luan van tan*.