Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
tranh va » tranh van, trang va, trinh va
cong tan » cong tac, cong san, cong thanh
toan ban » van ban
toan cao » toan tap
doi chi » doi khi

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) or (doi chi)) xanh - hanh tranh va nhung cong tan ((toan ban) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (doi chi)) xanh - hanh tranh va nhung cong tan ((toan ban) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (doi chi)) xanh - hanh tranh va nhung cong tan ((toan ban) or (toan cao))*.