Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
tung doanh » dung doanh, trong doanh, nhung doanh
chong cong » thong cong, cuong cong, phong cong
manh tung » manh hung, thanh tung
cong cong » cong dong, trong cong, dung cong
toan tap » toan ban
ho hieu » ho chieu, hoi hieu, nho hieu

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 quang - manh tung doanh ((chong cong) or (cong cong)) tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - manh tung doanh ((chong cong) OR (cong cong)) tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - manh tung doanh ((chong cong) or (cong cong)) tinh toan tap*.