Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
thanh tung » thanh cong
dang cong » dung cong
hieu cac » hieu luc, hieu va, hieu van
tung cua » trung cua, tuong cua, dung cua
cua dang » cua cong, cua ban
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap

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 (thien hach))) or (hieu cac)) - thanh tung cua dang cong tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((thieu sach) OR (thien hach))) OR (hieu cac)) - thanh tung cua dang cong tac than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((thieu sach) OR (thien hach))) or (hieu cac)) - thanh tung cua dang cong tac than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((((thieu sach) OR (thien hach))) or (hieu cac)) - thanh tung cua dang cong tac than cau*.