Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
tinh bang » tinh sang, tinh quang, tinh trang
tinh lang » dinh lang, tinh sang, tinh quang
hang cong » dang cong, hang nong, bang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap
toan cao » toan ban, toan tap
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 hieu manh - ((tinh bang) or (tinh lang)) va hang cong tan ((than cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((tinh bang) OR (tinh lang)) va hang cong tan ((than cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((tinh bang) or (tinh lang)) va hang cong tan ((than cau) or (toan cao))*.