Perhaps you should try some spelling variations:
phap thong » phap phong, phap chong, pho thong
kham thong » khap thong, khau thong, pham thuong
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » cac khoa, cac khoan, anh khoa
khoa phap » khoa phau, khoan phai, khong phap
thai thuc » thai thuy, thai tuc, tham thuc
thuc bach » truc bach, thuoc sach, thuc hanh
bach khoa » anh khoa
khoa kham » kho khan, khoa than
tu doanh » su doanh, te doanh, ty doanh
tai thuc » tri thuc, dai thuc, thi thuc
cac thai » cac thoi, ca thai, cac thi

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 thong ) OR ( tu cac thai thuc bach khoa kham thong ))~.
• Adding a wildcard symbol may retrieve word variants: (( tu doanh tai thuc cach khoa phap thong ) or ( tu cac thai thuc bach khoa kham thong ))*.