Perhaps you should try some spelling variations:
sach tham » sach nha
thuc van » thuc vat, thuc dan, thuc hanh
sach thu » sach thue, sach thieu, cach thuc
hanh di » hanh vi, hanh de, hang di
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
di cua » dai cua, doi cua, de cua
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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