Perhaps you should try some spelling variations:
phap thong » phap phong, phap chong, pho 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
sach dao » lanh dao
dao thuc » dan thuc, dao tuc, do thuc
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
tu cach » tu cac
cach am » cach lam, cach bao, cach nao
khoa he » hoa he, khoa hoc, khong he
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cach am thuc cach khoa he thong ) or ( su sach dao thuc anh khoa phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach am thuc cach khoa he thong ) OR ( su sach dao thuc anh khoa phap thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cach am thuc cach khoa he thong ) or ( su sach dao thuc anh khoa phap thong ))*.