Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thanh sinh » thanh binh, thanh tinh, thanh vinh
hieu lang » chieu sang, nhieu tang, hieu van
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
sinh cua » manh cua, dinh cuu, sinh va
san toan » van toan, dan toan, manh toan
toan tap » toan ban

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 sinh cua ((hang cong) or (bang cong)) san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - thanh sinh cua ((hang cong) OR (bang cong)) san toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - thanh sinh cua ((hang cong) or (bang cong)) san toan tap".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - thanh sinh cua ((hang cong) or (bang cong)) san toan tap*.