Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
tran tuan » tran xuan, tran quang, tran thanh
va duong » van duong, va tuong, va huong
cong tan » cong tac, cong san, cong thanh
va dung » van dung, vat dung, va ung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) OR (hieu quang)) - thanh trung ((va dung) or (va duong)) cong tan tran tuan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - thanh trung ((va dung) OR (va duong)) cong tan tran tuan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - thanh trung ((va dung) or (va duong)) cong tan tran tuan".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - thanh trung ((va dung) or (va duong)) cong tan tran tuan*.