Perhaps you should try some spelling variations:
khan thong » khap thong, khau thong, nhan thong
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
tai thuoc » tri thuoc, bai thuoc, tac thuoc
thuoc anh » thuoc thanh, thuoc dang, thuoc sach
cach hoa » cach hoan, cach hoc, bach hoa
dan tong » dan trong, han tong, dan dong
sach tai » sach bai, sach dao, sach xa
kho khan » khoa kham, khoa than
tu sach » thu sach, su sach, te sach
anh kho » anh khoa, anh tho, anh cho

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 tham thuc cach hoa dan tong ) or ( tu sach tai thuoc anh kho khan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thuc cach hoa dan tong ) OR ( tu sach tai thuoc anh kho khan thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thuc cach hoa dan tong ) or ( tu sach tai thuoc anh kho khan thong ))*.