Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thanh tran » thanh trang, thanh toan, thanh tra
hieu sang » chieu sang, hieu lang, nhieu tang
tran tuan » tran xuan, tran quang, tran thanh
tuan dung » tuan duong, tran dung, tan dung
dung cong » dung trong
cong danh » cuong danh, cong dan, cong thanh
tuan cau » toan cau, quan cau, tuan cu
toan ban » van ban

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