Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » hanh chinh
hoc thieu » toc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tran van » luan van

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) or (hanh trinh)) ((cua dung) or (su dung)) cong tac tran van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - ((canh tranh) OR (hanh trinh)) ((cua dung) OR (su dung)) cong tac tran van.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - ((canh tranh) or (hanh trinh)) ((cua dung) or (su dung)) cong tac tran van*.