Perhaps you should try some spelling variations:
thuoc toan » thuoc tan, thuoc thanh, thuat toan
phap phong » hai phong, phap phan
cach khuan » cac khoan, cach hoan
khoa thong » hoa thong, thoai thong, pho thong
tri thuoc » tri thuc, tri hoc, tin thuoc
khoa phap » khoa phau, khoan phai, khong phap
kinh thuc » sinh thuc, dinh thuc, hinh thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
sach tri » sach tai, sach tren, sach truc
thu sach » tu sach, thuat sach, thuoc sach
co sach » bo sach, cuon sach, hoc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( co sach tri thuoc toan khoa phap phong ) or ( thu sach kinh thuc cach khuan khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( co sach tri thuoc toan khoa phap phong ) OR ( thu sach kinh thuc cach khuan khoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( co sach tri thuoc toan khoa phap phong ) or ( thu sach kinh thuc cach khuan khoa thong ))*.