Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
hanh hang » thanh hang, hang hang, hanh han
dung cong » dung trong
hang tai » hang va, dung tai
tai dung » trai dung, thi dung, mai dung
van toan » van tuan, van tan, van thanh

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 hang tai dung cong ((xuan toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - hanh hang tai dung cong ((xuan toan) OR (van toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quang)) - hanh hang tai dung cong ((xuan toan) or (van toan)) cau*.