Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tri » thanh tri, hanh tai, hanh trinh
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, ang xa, dang xay
mang xa » lang xa, mang may, dang xay
van bac » van ban, van bao, van hac
cua tre » cua te, cuu tre, cua triet
luc va » tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ty ((xang xa) or (mang xa)) hoi. hieu van bac ((luc va) OR (duc va)) hanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty ((xang xa) OR (mang xa)) hoi. hieu van bac ((luc va) OR (duc va)) hanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty ((xang xa) or (mang xa)) hoi. hieu van bac ((luc va) OR (duc va)) hanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: bo sach ty ((xang xa) or (mang xa)) hoi. hieu van bac ((luc va) OR (duc va)) hanh tri cua tre*.