Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
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
thanh tra » thanh toan, thanh hoa
doc hieu » toc thieu, hoc thieu, hoc hien
tra ban » tri ban, tra bao, tranh 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 thanh tra 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 thanh tra ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh trinh ((luat bang) or (luan cong)) cong thanh tra ban*.