Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hieu manh » chieu xanh, hieu nganh, dieu hanh
canh tinh » hanh tinh, manh tinh, canh tranh
manh binh » thanh binh, ninh binh, tinh binh
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
tac phan » tac pham, tai phan, tac phat
phan lap » phan dau

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 tinh) or (manh binh)) va ((nhung cong) OR (dung cong)) tac phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((canh tinh) OR (manh binh)) va ((nhung cong) OR (dung cong)) tac phan lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((canh tinh) or (manh binh)) va ((nhung cong) OR (dung cong)) tac phan lap".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((canh tinh) or (manh binh)) va ((nhung cong) OR (dung cong)) tac phan lap*.