Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
thuc va » thuc dan, thuc day
dan tai » van tai, dan thi, han tai
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
va nay » va ngay, va cay

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: doc sach ky lang xa hoi. hieu va nay ((thuc va) OR (thuc vat)) dan tai cuu tre~.
• Adding a wildcard symbol may retrieve word variants: doc sach ky lang xa hoi. hieu va nay ((thuc va) or (thuc vat)) dan tai cuu tre*.