Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
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 trinh cua dung cong ((dan than) or (van ban)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trinh cua dung cong ((dan than) OR (van ban)) cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh trinh cua dung cong ((dan than) or (van ban)) cau*.