Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
theo hieu » theo chieu, theo tieu, thien hieu
hanh dung » thanh dung, anh dung, hanh dong
hang cong » dang cong, hang nong, bang cong
dung cong » dung trong
dung cua » dung luan, dung cho
toan cau » toan cao, toan tap, toan tai
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: theo hieu quang - hanh dung cua ((hang cong) or (dung cong)) dan ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu quang - hanh dung cua ((hang cong) OR (dung cong)) dan ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo hieu quang - hanh dung cua ((hang cong) or (dung cong)) dan ((toan cau) or (toan ban))*.