Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trong » hanh trang, anh trong, hinh trong
hieu lang » chieu sang, nhieu tang, hieu van
trong van » trong cac
hang cong » dang cong, hang nong, bang cong
van hang » van khang, van hoang, van thang
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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)) - hanh trong van hang cong san than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - hanh trong van hang cong san than cau*.