Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
thong cong » thong thong, phong chong, cong cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tong cong » cong cong, dung cong, dang cong
vang phan » van phan, nang phan, quang phan
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 - canh tranh luan ((((thong cong) OR (trong cong))) or (tong cong)) vang phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh luan ((((thong cong) OR (trong cong))) OR (tong cong)) vang phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh tranh luan ((((thong cong) OR (trong cong))) or (tong cong)) vang phan tu".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh luan ((((thong cong) OR (trong cong))) or (tong cong)) vang phan tu*.