Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
doan vi » doan va, don vi, doan thi
cac thu » cach thuc, cac thoi
van cac » van hac, van cau, van bac
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
lang ha » long ha
lang xa » dang xay, lang van
cua tre » cua te, cuu tre, cua triet
thu va » thuc va, thue va, tu va

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: tu sach ty ((lang xa) OR (lang ha)) hoi. hieu van cac thu va ((dan ca) OR (doan vi)) cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((lang xa) or (lang ha)) hoi. hieu van cac thu va ((dan ca) or (doan vi)) cua tre*.