Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va nam » van nam, ha nam
va dan » ca dan, va dao, va dau
va cuu » va chu, va huu
va cau » van cau, va cac, va dau
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: toc sach ky lang xa hoi. hieu ((va nam) OR (va nay)) thuc va dan ((va cuu) OR (va cau)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. hieu ((va nam) or (va nay)) thuc va dan ((va cuu) OR (va cau)) tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu ((va nam) or (va nay)) thuc va dan ((va cuu) OR (va cau)) tre*.