Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
dan chan » dan gian, dan ca
van chat » cao chat
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: doc hieu xanh - hanh trinh va hang cong ((dan chan) or (van chat)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh trinh va hang cong ((dan chan) OR (van chat)) cau*.