Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hanh di » hanh vi, hanh de, hang di
thuc va » thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
di cua » dai cua, doi cua, de cua
va cam » va cham, va cac, va cao

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: te ((sach ty) OR (sach thu)) xang xa hoi. hieu va cam ((thuc va) OR (thuc vat)) hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach thu)) xang xa hoi. hieu va cam ((thuc va) OR (thuc vat)) hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach thu)) xang xa hoi. hieu va cam ((thuc va) OR (thuc vat)) hanh di cua tre*.