Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang cong » dang cong, hang nong, bang cong
cong manh » cong danh, duong manh, cong thanh
hoc hieu » hoc thieu, hoc hien, doc hieu
trinh va » trinh van, trinh vat, trinh ve
toan cao » toan tap
toan ban » van 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 hieu manh - hanh trinh va hang cong manh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh trinh va hang cong manh ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh trinh va hang cong manh ((toan cao) or (toan ban))*.