Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tang luan » dung luan
hoc hieu » hoc thieu, hoc hien, doc hieu
hang cua » mang cua, hang ca, huong cua
cong tac » cong ty
tvan cau » toan cau, toan cao, va cau
van cau » van dau, van hau, van chat

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: hoc hieu manh - anh ((tang luan) OR (hang cua)) nhung cong tac ((tvan cau) OR (van cau))~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - anh ((tang luan) or (hang cua)) nhung cong tac ((tvan cau) or (van cau))*.