Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
tranh van » tran van, trinh van, thanh van
van thong » van thuong, van phong, va thong
luan phan » luan van, luan hoan
van khan » van khanh, van khang, van phan

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 - canh tranh van thong cong ((van khan) or (luan phan)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - canh tranh van thong cong ((van khan) OR (luan phan)) cap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - canh tranh van thong cong ((van khan) or (luan phan)) cap*.