Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hien xanh » hien hanh, hien nhanh, chieu xanh
nang cong » nang song, dang cong, bang cong
trinh va » trinh van, trinh vat, trinh ve
dan toan » van toan, dan than, manh toan
dan chan » dan gian, dan ca, van chat
va nang » van nang, da nang, cam nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - canh trinh va nang cong ((dan toan) or (dan chan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh trinh va nang cong ((dan toan) OR (dan chan)) cau*.