Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham thuc » nham thuc, pham thuc, tham thuc
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
vat danh » van danh, luat danh, nhat danh
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
xay hoi » xa hoi, tay hoi, cay phoi
va danh » va dinh, va dan, va hanh
cua te » cua 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 ty dang xay hoi. hieu van cham thuc ((vat danh) or (va danh)) dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty dang xay hoi. hieu van cham thuc ((vat danh) OR (va danh)) dai cua te.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty dang xay hoi. hieu van cham thuc ((vat danh) or (va danh)) dai cua te*.