Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu sach » chieu sach, hieu cach, dien sach
cong doan » cong dan, cong hoan, dong doanh
doan phan » doanh phan, toan phan, dan phan
doc hieu » toc thieu, hoc thieu, hoc hien
cap cong » cac cong, tap cong, cau cong
cao cong » cac cong, cao dang, cua cong
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - thanh tung ((cap cong) or (cao cong)) cong doan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - thanh tung ((cap cong) OR (cao cong)) cong doan phan dau.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh tung ((cap cong) or (cao cong)) cong doan phan dau*.