Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, diep quang
thanh tran » thanh trang, thanh tra, thanh tuan
thanh toan » thanh hoa, thanh san, tinh toan
dung tuong » dung thuong, dung truong, dung trong
tuan dung » tuan duong, tran dung, tan dung
tuong dan » huong dan, tung dan, xuong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 quang) OR (hieu qua)) - ((thanh tran) or (thanh toan)) tuan dung tuong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu quang) OR (hieu qua)) - ((thanh tran) OR (thanh toan)) tuan dung tuong dan toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu quang) OR (hieu qua)) - ((thanh tran) or (thanh toan)) tuan dung tuong dan toan cau*".