Perhaps you should try some spelling variations:
phap thong » phap phong, phap chong, pho thong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
khoa phap » khoa phau, khoan phai, khong phap
toc sach » hoc sach, doc sach, thuoc sach
cach hoa » cach hoan, cach hoc, bach hoa
sanh tri » thanh tri, dinh tri, minh tri
tri thuc » tri tue
so sanh » do sanh
thuc da » thuc dan, thuc day, thuc dia

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( toc sach tren thuc cach hoa he thong ) or ( so sanh tri thuc da khoa phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach tren thuc cach hoa he thong ) OR ( so sanh tri thuc da khoa phap thong )).
• Adding a wildcard symbol may retrieve word variants: (( toc sach tren thuc cach hoa he thong ) or ( so sanh tri thuc da khoa phap thong ))*.