Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
canh trang » canh tranh, hanh trang, banh trang
hang cong » dang cong, hang nong, bang cong
trang va » tran van, hang va
cong tac » cong ty
phan cau » phan dau, phan cac, phan tu
toan tap » toan ban
va hang » van hang, va nang, va lang

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)) - canh trang va hang cong tac ((phan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - canh trang va hang cong tac ((phan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (thien hach)) - canh trang va hang cong tac ((phan cau) or (toan tap))*.