Perhaps you should try some spelling variations:
phap phong » hai phong, phap phan
khan thong » khap thong, khau thong, nhan thong
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
khoa phap » khoa phau, khoan phai, khong phap
tu doanh » su doanh, te doanh, ty doanh
tai thuc » thai thuc, tri thuc, dai thuc
thai tuc » thai thuc, thai thuy, thai hoc
tuc hanh » thuc hanh, tuc thanh, duc hanh
hanh kho » hanh khu, hang khoa, hanh theo
kho khan » khoa kham, khoa than
tu toc » tu hoc, tu goc, tu tot

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 doanh tai thuc cach khoa phap phong ) OR ( tu toc thai tuc hanh kho khan thong ))~.
• Adding a wildcard symbol may retrieve word variants: (( tu doanh tai thuc cach khoa phap phong ) or ( tu toc thai tuc hanh kho khan thong ))*.