Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thanh hang » thanh hoang, thanh thang, tranh hang
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, nhieu tang, hieu van
va thong » va thuong, va phuong, he thong
ban tran » ban trang, ban than, bao tran

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) OR (hieu quang)) - thanh hang va thong cong ((ban tran) or (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu quang)) - thanh hang va thong cong ((ban tran) OR (tan tran)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) OR (hieu quang)) - thanh hang va thong cong ((ban tran) or (tan tran)) cau".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) OR (hieu quang)) - thanh hang va thong cong ((ban tran) or (tan tran)) cau*.