Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tri » thanh tri, hanh tai, hanh trinh
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
van coc » van hoc, van loc, van co
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
luc va » tuc va, loc va

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y lang xa hoi. hieu van coc ((luc va) OR (duc va)) hanh tri cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach y lang xa hoi. hieu van coc ((luc va) OR (duc va)) hanh tri cua tre*.