Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham thuc » nham thuc, pham thuc, tham thuc
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
hanh de » hanh ve, hanh kem
de su » den su, ve su, de tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y ((sang ma) or (mang may)) hoi. hieu va cham thuc van hanh de su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((sang ma) OR (mang may)) hoi. hieu va cham thuc van hanh de su triet.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((sang ma) or (mang may)) hoi. hieu va cham thuc van hanh de su triet*.