Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh van » trinh han, trinh quan, trinh toan
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
hoc hieu » hoc thieu, hoc hien, doc hieu
dan phan » doan phan, dan chan, dam phan
van phan » van phong, van thanh, luan phan

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 - canh trinh van ((hang cong) or (dang cong)) ((dan phan) or (van phan)) cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh trinh van ((hang cong) OR (dang cong)) ((dan phan) OR (van phan)) cac.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh trinh van ((hang cong) or (dang cong)) ((dan phan) or (van phan)) cac*.