Perhaps you should try some spelling variations:
thong cong » tong cong, thong thong, phong chong
lanh tranh » canh tranh, lan tranh, hanh trinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh cua » doanh cua, manh cua
doc hieu » toc thieu, hoc thieu, hoc hien
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - lanh tranh cua ((thong cong) OR (trong cong)) dan than ban~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - lanh tranh cua ((thong cong) OR (trong cong)) dan than ban*.