Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hanh trinh » hanh chinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang cong » dang cong, hang nong, bang cong
dan thanh » dang thanh, danh thanh, ban thanh
thanh cac » hanh cac, thanh bac, thanh ca
hoc hieu » hoc thieu, hoc hien, doc hieu

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 - ((hanh trinh) OR (canh tranh)) cua ((nhung cong) or (hang cong)) dan thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hanh trinh) OR (canh tranh)) cua ((nhung cong) OR (hang cong)) dan thanh cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((hanh trinh) OR (canh tranh)) cua ((nhung cong) or (hang cong)) dan thanh cac".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh trinh) OR (canh tranh)) cua ((nhung cong) or (hang cong)) dan thanh cac*.