Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
luat quang » luat quan, xuat quang, chat quang
cong thanh » dong thanh, cong trinh, cong tan
thanh tran » thanh trang, thanh toan, thanh tra
hieu lang » chieu sang, hieu quang, nhieu tang
luan cong » luat cong, luong cong, luan chung
doc hieu » toc thieu, hoc thieu, hoc hien
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 quang) or (luan cong)) cong thanh tran ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - hanh trinh ((luat quang) OR (luan cong)) cong thanh tran ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh trinh ((luat quang) or (luan cong)) cong thanh tran ban*.