Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
danh thanh » dinh thanh, dang thanh, nhanh thanh
hieu sang » chieu sang, hieu lang, nhieu tang
lanh manh » lanh tranh, lan anh, van manh
cong danh » cuong danh, cong dan, cong thanh
thanh tu » hanh tu, nhanh tu, thanh tung

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 sang) or (hieu quang)) - lanh manh ((cua nhung) OR (va nhung)) cong danh thanh tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu quang)) - lanh manh ((cua nhung) OR (va nhung)) cong danh thanh tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) or (hieu quang)) - lanh manh ((cua nhung) OR (va nhung)) cong danh thanh tu".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu quang)) - lanh manh ((cua nhung) OR (va nhung)) cong danh thanh tu*.