Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
manh trung » manh tung, thanh trung, manh hung
hieu lang » chieu sang, nhieu tang, hieu van
hang cong » dang cong, hang nong, bang cong
dan thanh » dang thanh, danh thanh, ban thanh
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
thanh ca » thanh cha, thanh cac, thanh ha
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (hieu quang)) - manh trung va hang cong dan thanh ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (hieu quang)) - manh trung va hang cong dan thanh ca.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (hieu quang)) - manh trung va hang cong dan thanh ca*.