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

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