Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tranh » canh tranh, hanh trang, lanh tranh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoang van » hang va
hoc hieu » hoc thieu, hoc hien, doc hieu
cong van » cong vang, cong san, song van
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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 tranh) or (hanh trinh)) va dung ((cong van) or (hoang van)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hanh tranh) OR (hanh trinh)) va dung ((cong van) OR (hoang van)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh tranh) or (hanh trinh)) va dung ((cong van) or (hoang van)) toan cao*.