Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, chong cong
tang luan » dung luan
cong danh » cuong danh, cong dan, cong thanh
hoc xanh » hoc anh, hoc hanh, hoc danh
tang cua » mang cua, hang cua, thong cua
toan cau » toan cao, toan ban, toan tai
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 (tang luan)) khong cong danh ((toan cau) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cho hoc xanh - hanh ((tang cua) OR (tang luan)) khong cong danh ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: cho hoc xanh - hanh ((tang cua) OR (tang luan)) khong cong danh ((toan cau) OR (toan tap))*.