Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh tang » hanh trang, anh tang, hanh mang
nhu hieu » nhu hien, nho hieu, nhu dieu
nha hieu » nha dieu, nghe hieu, phan hieu
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
tang va » trang va, tang van, thang va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((nhu hieu) OR (nha hieu)) lang - hanh tang va nhung cong tan ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nhu hieu) OR (nha hieu)) lang - hanh tang va nhung cong tan ((toan cau) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ((nhu hieu) OR (nha hieu)) lang - hanh tang va nhung cong tan ((toan cau) or (toan ban))*.