Perhaps you should try some spelling variations:
danh nhan » doanh nhan, thanh nhan, benh nhan
cua khong » cua phuong, cua thuong, cua cong
hua khong » hoa khong, hoac khong, phuc khong
hoc xanh » hoc anh, hoc hanh, hoc danh
cuong ma » cuong _
toan cao » toan ban, toan tap
ma toan » va toan, ma tran, manh toan

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 - danh nhan ((cua khong) or (hua khong)) cuong ma toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co hoc xanh - danh nhan ((cua khong) OR (hua khong)) cuong ma toan cao.
• Adding a wildcard symbol may retrieve word variants: co hoc xanh - danh nhan ((cua khong) or (hua khong)) cuong ma toan cao*.