Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van dinh » van minh, van dich, va dinh
hien cac » thien cac, vien cac, hieu cac
tu sach » thu sach, su sach, tu cach
dinh va » dinh van, dinh ve, tinh va
lao van » dao van, cao van, lo van
cac lao » ca lao, cac loai, cac giao
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
te sach » toc sach
va cua » va chua, via cua, ca cua

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) OR (te sach)) ky ((nang xa) OR (nang ma)) hoi. hieu hien cac lao van dinh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky ((nang xa) OR (nang ma)) hoi. hieu hien cac lao van dinh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky ((nang xa) OR (nang ma)) hoi. hieu hien cac lao van dinh va cua tre*.