Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
cong thuat » trong thuat, vuong thuat, cong thuc
thuat bang » thuat ban, thuat mang, thuat nang
hieu manh » chieu xanh, dieu hanh, hien hanh
bang cong » dang cong, bang song, hang cong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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 nganh) OR (hieu manh)) - thanh cong thuat bang cong tan van ban~.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) or (hieu manh)) - thanh cong thuat bang cong tan van ban*.