Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tranh » canh tranh, hanh trang, lanh tranh
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
thanh chu » thanh chau, thanh cha, thanh thu
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung

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) OR (hanh trinh)) cua dung 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) OR (hanh trinh)) cua dung 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) OR (hanh trinh)) cua dung cong vang ((thanh pho) or (thanh chu))".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - ((hanh tranh) OR (hanh trinh)) cua dung cong vang ((thanh pho) or (thanh chu))*.