Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
nhung cong » dung cong, thong cong, hang cong
hieu cac » hieu luc, hieu va, hieu van
tinh cua » trinh cua, sinh cua, tinh chat
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
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 (hieu cac)) - hanh ((tinh cua) or (trinh luat)) nhung cong ban than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cac)) - hanh ((tinh cua) OR (trinh luat)) nhung cong ban than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu cac)) - hanh ((tinh cua) or (trinh luat)) nhung cong ban than cau*.