Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
tong cong » trong cong, cong cong, dung cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tap » toan ban
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - hanh ((tran van) or (luan van)) tong cong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((tran van) OR (luan van)) tong cong dan toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((tran van) or (luan van)) tong cong dan toan tap*.