Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh di » thanh doi, thanh de, thanh do
tu sach » thu sach, su sach, te sach
luc gia » luoc gia, duc gia, quoc gia
cac luc » cau luc, coc luc, cac nuoc
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty hang, ly nang
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty nang) or (ty xang)) ((x hoi) OR (o hoi)). hieu van cac luc gia thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) ((x hoi) OR (o hoi)). hieu van cac luc gia thanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty xang)) ((x hoi) OR (o hoi)). hieu van cac luc gia thanh di cua tre*".