Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
bang cong » dang cong, bang song, hang cong
cua bang » chua bang, cua ban, cua dang
dan than » dan chan, ban than, van than
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh tranh cua bang cong ((van ban) or (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh tranh cua bang cong ((van ban) OR (dan than)) cao.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh tranh cua bang cong ((van ban) or (dan than)) cao*.