Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
dinh vai » dinh van, dinh vi, dinh va
sach tu » cach tu, sach ty, sach uu
hieu va » lieu va, hieu qua
do thuc » hoc thuc, dan thuc
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho
va do » va dao, va doc, va co

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach tu) or (sach thu)) nang x hoi. hieu va do thuc va dinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (sach thu)) nang x hoi. hieu va do thuc va dinh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (sach thu)) nang x hoi. hieu va do thuc va dinh vai cua tre*.