Perhaps you should try some spelling variations:
phap thong » phap phong, phap chong, pho thong
thuoc sach » hoc sach, nuoc sach, thuat sach
thuc bach » truc bach, thuc cach, thuc hanh
khoa phap » khoa phau, khoan phai, khong phap
thu sach » thuat sach, thu hoach, khau sach
tu sach » su sach, te sach, tu cach

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) or (thu sach)) tren ((thuc bach) OR (thuoc sach)) khoa phap thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) tren ((thuc bach) OR (thuoc sach)) khoa phap thong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) tren ((thuc bach) OR (thuoc sach)) khoa phap thong".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) tren ((thuc bach) OR (thuoc sach)) khoa phap thong*.