Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
thanh chu » thanh chau, thanh cha, thanh thu
doc hieu » toc thieu, hoc thieu, hoc hien

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 tranh cua ((hang cong) OR (bang cong)) vang ((thanh pho) or (thanh chu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - hanh tranh cua ((hang cong) OR (bang cong)) vang ((thanh pho) OR (thanh chu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - hanh tranh cua ((hang cong) OR (bang cong)) vang ((thanh pho) or (thanh chu))".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh tranh cua ((hang cong) OR (bang cong)) vang ((thanh pho) or (thanh chu))*.