Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
sach thuc » cach thuc, sach thu, sach thue
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
vai cua » dai cua, bai cua, mai cua
thuc va » thuc vat, thuc dan, thuc day
va tham » van tham, va cham, va thuat
hieu va » lieu va, hieu qua
hanh ma » hanh mau, hanh may, hanh va
ma hoi » mai hoi, xa hoi, ma hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thuc hanh ma hoi. hieu va tham thuc va thanh ((vai cua) OR (((lai cua) OR (hai cua)))) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thuc hanh ma hoi. hieu va tham thuc va thanh ((vai cua) or (((lai cua) OR (hai cua)))) tre~".
• Adding a wildcard symbol may retrieve word variants: so sach thuc hanh ma hoi. hieu va tham thuc va thanh ((vai cua) or (((lai cua) OR (hai cua)))) tre*.