Perhaps you should try some spelling variations:
phap thong » phap phong, phap chong, pho thong
sach thai » sach tham, sac thai, sach tai
thuc bach » truc bach, thuoc sach, thi bach
thuc cach » thuoc sach, truoc cach, tuc cac
khoa phap » khoa phau, khoan phai, khong phap
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 thai ((thuc bach) or (((thuc cach) or (thuc hanh)))) khoa phap thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thai ((thuc bach) OR (((thuc cach) OR (thuc hanh)))) khoa phap thong.
• Adding a wildcard symbol may retrieve word variants: tu sach thai ((thuc bach) or (((thuc cach) or (thuc hanh)))) khoa phap thong*.