Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
ndoc hieu » ngoc hieu, duc hieu, nho hieu
hanh mang » nhanh mang, hanh trang, nhanh lang
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
toan cao » toan tap
toan ban » van ban
mang va » mang vua, hang va, bang 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: ((doc hieu) OR (ndoc hieu)) lang - hanh mang va nhung cong tan ((toan cao) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (ndoc hieu)) lang - hanh mang va nhung cong tan ((toan cao) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (ndoc hieu)) lang - hanh mang va nhung cong tan ((toan cao) OR (toan ban))*.