Perhaps you should try some spelling variations:
khoan khau » khoanh khac, khoa kham, khoa phau
khau thong » khau thuong, khap thong, khau tong
thuc cach » thuoc sach, truoc cach, thuc hanh
sach bai » cac bai, sach xa
bai thuc » bai thuoc, bao thuc, dai thuc
thuc cac » tuc cac, phuc cac, thac cac
thu sach » thuat sach, thuoc sach, thu hoach
sach dao » lanh dao
dao thuc » dan thuc, dao tuc, do thuc
cach hoa » cach hoan, cach hoc, bach hoa
tu sach » su sach, te sach, tu cach

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 khau thong ) or ( thu sach dao thuc cach hoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach bai thuc cac khoan khau thong ) OR ( thu sach dao thuc cach hoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach bai thuc cac khoan khau thong ) or ( thu sach dao thuc cach hoa he thong ))*.