Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
thong cong » trong cong, tong cong, thong thong
thanh cham » thanh pham, thanh cha, hanh cham
hieu manh » chieu xanh, dieu hanh, hieu van
hien hanh » dieu hanh
ban thanh » ban hanh, ban hang
tranh he » trinh he, tranh ha, tinh he
cong ban » cong bang, cong san, cong tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((hieu manh) OR (hien hanh))) or (hieu nganh)) - canh tranh he thong cong ban thanh cham~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu manh) OR (hien hanh))) OR (hieu nganh)) - canh tranh he thong cong ban thanh cham.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hieu manh) OR (hien hanh))) or (hieu nganh)) - canh tranh he thong cong ban thanh cham".
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu manh) OR (hien hanh))) or (hieu nganh)) - canh tranh he thong cong ban thanh cham*.