Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
thuc cach » thuoc sach, truoc cach, thuc hanh
sach thai » sach tham, sac thai, sach tai
thai thuc » thai thuy, thai tuc, tham thuc
thuc than » thuc thanh, thuc thai, thuc chan
phu thong » pho thong, phap thong, phan thong
bai thuc » bai thuoc, bao thuc, dai thuc
cach hoc » cach thuc, cach thoi, dich hoc
hoc khau » hoc khac, hoc kham, hoc huu
than hoc » toan hoc, thai hoc, than doc
tu sach » thu sach, su sach, te sach
hoc phu » hoc pho, toc phu, hoc chu

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

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