Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
sach ky » sac ky, sach y, sach ty
vai cuu » vai cua
dan vai » dan va, dan tai, dan vat
day dan » day danh, dao dan, cay dan
cuu tre » cua tre, cau tren, cau treo
long ha » dong ha, cong ha, dong hoa
va nay » va ngay, va cay
va nam » van nam, ha nam

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: toc sach ky ((lang ha) OR (long ha)) hoi. hieu ((va nam) OR (va nay)) thuc day dan vai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((lang ha) OR (long ha)) hoi. hieu ((va nam) or (va nay)) thuc day dan vai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang ha) OR (long ha)) hoi. hieu ((va nam) or (va nay)) thuc day dan vai cuu tre*.