Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
luat cong » thuat cong, luat chung, cua cong
doc hieu » toc thieu, hoc thieu, hoc hien
luat ban » luat bao, luat dan, luat bat
cong tan » cong tac, cong san, cong thanh
tran van » luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - hanh trinh ((luat ban) or (luat cong)) cong tan tran van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - hanh trinh ((luat ban) OR (luat cong)) cong tan tran van.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh trinh ((luat ban) or (luat cong)) cong tan tran van*.