Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
thanh nhan » thanh phan, thanh san, thanh toan
mach hoc » cach hoc, dich hoc, anh hoc
tung hoc » trung hoc, tuong hoc, dung hoc
hoc anh » hoc nganh, hoc nhanh, ngoc anh
anh hoa » anh khoa, danh hoa, hanh hoa
hoc xa » hoc ma
xa hoc » xa hoi, va hoc, xa hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat mach hoc tap, nhiem huu tung hoc anh hoa hoc xa hoc ((doanh nhan) or (thanh nhan)) tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat mach hoc tap, nhiem huu tung hoc anh hoa hoc xa hoc ((doanh nhan) OR (thanh nhan)) tai.
• Adding a wildcard symbol may retrieve word variants: thuat mach hoc tap, nhiem huu tung hoc anh hoa hoc xa hoc ((doanh nhan) or (thanh nhan)) tai*.