Perhaps you should try some spelling variations:
khong phap » chong phap, khong phai, phuong phap
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
thuc bach » truc bach, thuc cach, thuoc sach
khoa phap » khoan phai, hoa phan, hoc phap
khoa phau » hoa phan, khoa kham, khoa than
tu sach » thu sach, su sach, te 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 sach tham thuc bach ((((khoa phap) OR (khoa phau))) or (khong phap)) thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tham thuc bach ((((khoa phap) OR (khoa phau))) OR (khong phap)) thong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tham thuc bach ((((khoa phap) OR (khoa phau))) or (khong phap)) thong".
• Adding a wildcard symbol may retrieve word variants: tu sach tham thuc bach ((((khoa phap) OR (khoa phau))) or (khong phap)) thong*.