Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
van thanh » ban thanh, van tuan
hoc hieu » hoc thieu, hoc hien, doc hieu
tranh va » tranh van, trang va, trinh va
van tan » van tuan, van ban, van tai

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 lang - hanh tranh va nhung cong ((van thanh) or (van tan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh tranh va nhung cong ((van thanh) OR (van tan)) cao*.