Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
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
tho thuc » thi thuc, tho thuy, thu thuc
co sach » bo sach, cuon sach, hoc sach
anh tho » anh khoa, anh thuc
do anh » do sanh, do danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( co sach tham thuc hanh khoa khau thong ) or ( do anh tho thuc hanh khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( co sach tham thuc hanh khoa khau thong ) OR ( do anh tho thuc hanh khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( co sach tham thuc hanh khoa khau thong ) or ( do anh tho thuc hanh khoa khau thong ))*.