Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
anh tang » anh bang, anh dang, anh nang
cong tac » cong ty
toan cau » toan ban, toan tai
toan cao » toan ban
toan tap » toan ban
tang va » trang va, tang van, thang va

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 lang - anh tang va nhung cong tac ((toan cau) or (((toan cao) or (toan tap))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - anh tang va nhung cong tac ((toan cau) OR (((toan cao) OR (toan tap)))).
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - anh tang va nhung cong tac ((toan cau) or (((toan cao) or (toan tap))))*.