Perhaps you should try some spelling variations:
thanh tung » thanh cong
thieu sach » chieu sach, thien hach, hieu cach
dong cong » duong cong, dung cong, dang cong
tung cua » trung cua, tuong cua, dung cua
cua dong » chua dong, cua cong, cua dang
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap
hieu ca » hieu cac, hieu cua, hieu va

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) or (hieu ca)) - thanh tung cua dong cong tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu ca)) - thanh tung cua dong cong tac than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu ca)) - thanh tung cua dong cong tac than cau*.