Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
gianh lai » gian lan
pham thuc » phap thuc, pham chuc, nham thuc
va gianh » va gian, van giang, va giai
hieu san » hieu van, chieu sang, hieu suat
hieu sau » hieu su, hieu suat, tieu su
lai cua » dai cua, hai cua, lai chau
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa

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 ky tang ma hoi. ((hieu san) or (hieu sau)) pham thuc va gianh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky tang ma hoi. ((hieu san) OR (hieu sau)) pham thuc va gianh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky tang ma hoi. ((hieu san) or (hieu sau)) pham thuc va gianh lai cua tre*.