Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
cua khong » cua phuong, cua thuong, cua cong
hua khong » hoa khong, hoac khong, phuc khong
cuong tap » luong tap, cong tac, luong tai
hoc xanh » hoc anh, hoc hanh, hoc danh
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: co hoc xanh - thanh toan ((cua khong) or (hua khong)) cuong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co hoc xanh - thanh toan ((cua khong) OR (hua khong)) cuong tap toan ban.
• Adding a wildcard symbol may retrieve word variants: co hoc xanh - thanh toan ((cua khong) or (hua khong)) cuong tap toan ban*.