Perhaps you should try some spelling variations:
chong cong » cong cong, thong cong, cuong cong
phung cong » nhung cong, phong cong, nhung chong
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu xanh - hanh tang luan ((chong cong) or (phung cong)) ((tac toan) or (tam toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu xanh - hanh tang luan ((chong cong) OR (phung cong)) ((tac toan) OR (tam toan)) cau.
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - hanh tang luan ((chong cong) or (phung cong)) ((tac toan) or (tam toan)) cau*.