Perhaps you should try some spelling variations:
tcanh tranh » thanh thanh, can tranh, lanh tranh
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - ((canh tranh) or (tcanh tranh)) va ((nhung cong) OR (thong cong)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((canh tranh) OR (tcanh tranh)) va ((nhung cong) OR (thong cong)) dan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((canh tranh) or (tcanh tranh)) va ((nhung cong) OR (thong cong)) dan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((canh tranh) or (tcanh tranh)) va ((nhung cong) OR (thong cong)) dan toan tap*.