Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hang cong » dang cong, hang nong, bang cong
van thanh » van tuan
ban thanh » ban hanh, ban hang
hoc dieu » hoc thieu
tranh va » tranh van, trang va, trinh va
va hang » van hang, va nang, va lang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc dieu) OR (hoc hien)) xanh - hanh tranh va hang cong ((van thanh) OR (ban thanh)) phan~.
• Adding a wildcard symbol may retrieve word variants: ((hoc dieu) or (hoc hien)) xanh - hanh tranh va hang cong ((van thanh) or (ban thanh)) phan*.