Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh dung » thanh dung, anh dung, hanh dong
dung cong » dung trong
manh toan » thanh toan, anh tuan
dung cua » dung luan, dung cho
cua dung » cua dang, cua dong, qua dung

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) or (nhieu tang)) - hanh dung cua dung cong ((manh toan) or (tinh toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu quang) OR (nhieu tang)) - hanh dung cua dung cong ((manh toan) OR (tinh toan)) ban.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu quang) or (nhieu tang)) - hanh dung cua dung cong ((manh toan) or (tinh toan)) ban*.