Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
hoc xanh » hoc anh, hoc hanh, hoc danh
tang cua » mang cua, hang cua, tang luan
manh cua » doanh cua, ban cua
dan toan » van toan, dan than, manh toan
toan tap » toan ban
cho hoc » co hoc, khoa hoc

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

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