Perhaps you should try some spelling variations:
khong phap » chong phap, khong phai, phuong phap
cach khong » cach phong, cac phong, bach khang
phap thong » phap phong, phap chong, pho thong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
khoan phu » khoa phu, khoan phai, khoa thu
phu thong » pho thong, khau thong, phan thong
thuc cach » thuoc sach, truoc cach, thuc hanh
thuc cac » tuc cac, phuc cac, thac cac
te sach » toc sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tren thuc cac khoan phu thong ) or ( te sach tren thuc cach khong phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tren thuc cac khoan phu thong ) OR ( te sach tren thuc cach khong phap thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tren thuc cac khoan phu thong ) or ( te sach tren thuc cach khong phap thong ))*.