Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
thong cong » trong cong, thong thong, phong chong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tong cong » trong cong, cong cong, dung cong
vang phan » nang phan, quang phan, va phan
hoc hieu » hoc thieu, hoc hien, doc hieu
van phan » van phong, van thanh, luan phan

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 luan ((thong cong) or (tong cong)) ((vang phan) OR (van phan)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh luan ((thong cong) OR (tong cong)) ((vang phan) OR (van phan)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh tranh luan ((thong cong) or (tong cong)) ((vang phan) OR (van phan)) tu".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh luan ((thong cong) or (tong cong)) ((vang phan) OR (van phan)) tu*.