Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
tac thanh » bac thanh, cac thanh, tcc thanh
hoc hieu » hoc thieu, hoc hien, doc hieu
tac than » tam than, tac nhan, bac thanh

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 - canh tranh cua nhung cong ((tac than) OR (tac thanh)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh tranh cua nhung cong ((tac than) OR (tac thanh)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh cua nhung cong ((tac than) OR (tac thanh)) cao*.