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
khoa phap » khoa phau, khoan phai, khong phap
tren thac » trien thuc, tren thi, tren phan
thac cach » thac cac, thuc cach, nhan cach
cach thoi » cac thoi, cach thuc, cach noi
thuc dan » thuc hanh, hoc dan, thuc vat
dan khoa » dang khoa, da khoa, san khoa
tu sach » thu sach, su sach, tu cach
te sach » toc sach
thoi he » khoi he, thoi hien, thoai hy

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 tren thuc dan khoa phap thong ) or ( te sach tren thac cach thoi he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tren thuc dan khoa phap thong ) OR ( te sach tren thac cach thoi he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tren thuc dan khoa phap thong ) or ( te sach tren thac cach thoi he thong ))*.