Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, hieu van
hanh tang » hanh trang, anh tang, hanh mang
dang cong » dung cong
tang cua » mang cua, hang cua, tang luan
cua dang » cua cong, cua ban
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((hieu lang) or (nhieu tang))) or (chieu sach)) - hanh tang cua dang cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu lang) OR (nhieu tang))) OR (chieu sach)) - hanh tang cua dang cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu lang) or (nhieu tang))) or (chieu sach)) - hanh tang cua dang cong tac toan cau*.