Perhaps you should try some spelling variations:
khoan phap » khoan phai, khoa phau, han phap
phap thong » phap phong, phap chong, phap tieng
pho thong » he thong
sach tai » sach bai, sach tham, sach dao
tai thuc » thai thuc, tri thuc, dai thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan khoa » dang khoa, da khoa, san khoa
khoa pho » khoa phu, khoa khoa, khoa phau
bai thuc » bai thuoc, bao thuc, dai thuc
thuc cac » thuc cach, tuc cac, phuc cac
tu sach » thu sach, su sach, te sach
te cac » tu cac, ve cac, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach tai thuc dan khoa pho thong ) or ( te cac bai thuc cac khoan phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tai thuc dan khoa pho thong ) OR ( te cac bai thuc cac khoan phap thong ))*.