Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
khoan phu » khoa phu, khoan phai, khoa thu
phu thong » pho thong, phap thong, phan thong
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa khau » khoa kham, khoa phau, khoa chau
sach bai » sach dao, cac bai, sach xa
bai thuc » bai thuoc, bao thuc, dai thuc
thuc cac » thuc cach, tuc cac, phuc cac
tu sach » thu sach, su sach, tu cach
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: (( tu sach bai thuc cac khoan phu thong ) or ( te sach tham thuc hanh khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach bai thuc cac khoan phu thong ) OR ( te sach tham thuc hanh khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach bai thuc cac khoan phu thong ) or ( te sach tham thuc hanh khoa khau thong ))*.