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

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