Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
niem nang » tiem nang, nhiet nang, nham nang
hanh tang » hanh trang, anh tang, hanh mang
cua khong » hua khong, cua phuong, cua thuong
tang cua » mang cua, hang cua, tang luan
cong tan » cong tac, cong san, cong ty
tran cau » tran chau, toan cau, ran cau
them » theo, tham

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

• Performing a fuzzy search may retrieve terms with similar spellings: them niem nang - hanh tang cua khong ((cong tan) or (cong thanh)) tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: them niem nang - hanh tang cua khong ((cong tan) OR (cong thanh)) tran cau.
• Adding a wildcard symbol may retrieve word variants: them niem nang - hanh tang cua khong ((cong tan) or (cong thanh)) tran cau*.