Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, nhung don
theo hieu » theo chieu, theo tieu, thien hieu
hanh dung » thanh dung, anh dung, hanh dong
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
dung cua » dung luan, dung cho
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu quang - hanh dung cua ((nhung cong) OR (((hang cong) OR (dang cong)))) tan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu quang - hanh dung cua ((nhung cong) or (((hang cong) OR (dang cong)))) tan toan ban~".
• Adding a wildcard symbol may retrieve word variants: theo hieu quang - hanh dung cua ((nhung cong) or (((hang cong) OR (dang cong)))) tan toan ban*.