Perhaps you should try some spelling variations:
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
hoach tron » hoach trong, hoach toan, hoach toi
khoa thong » hoa thong, thoai thong, pho thong
cach thuc » anh thuc, cac thu
thuc thuc » hoc thuc
tron thuc » trong thuc, toan thuc, trong thu
thuc cach » thuoc sach, truoc cach, thuc hanh
thuc cac » tuc cac, phuc cac, thac cac
cach hoc » cach thoi, dich hoc, cac hop
hoc khoa » hoc pho
tu cach » tu cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach thuc thuc cac khoan phai thong ) OR ( thu hoach tron thuc cach hoc khoa thong ))~.
• Adding a wildcard symbol may retrieve word variants: (( tu cach thuc thuc cac khoan phai thong ) or ( thu hoach tron thuc cach hoc khoa thong ))*.