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
thuc dan » thuc hanh, hoc dan, thuc vat
dan khoa » dang khoa, da khoa, san khoa
cach noi » cach thoi, hanh noi, anh noi
tu sach » thu sach, su sach, tu cach
te sach » toc sach
noi he » noi ve, moi he, noi de

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 noi 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 noi he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tren thuc dan khoa phap thong ) or ( te sach tren thac cach noi he thong ))*.