Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
hieu quang » thieu quang, hieu quan, hieu qua
dung cong » dung trong
anh tang » anh bang, anh dang, anh nang
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
tang va » trang va, tang van, thang va
va dung » van dung, va duong, vat 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 ((nhieu tang) or (hieu quang)) - anh tang va dung cong tan ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((nhieu tang) OR (hieu quang)) - anh tang va dung cong tan ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: theo ((nhieu tang) or (hieu quang)) - anh tang va dung cong tan ((toan cau) or (toan tap))*.