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