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

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) OR (te sach)) ((ty nang) or (ty xang)) x hoi. hieu van coc luc gia thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ((ty nang) OR (ty xang)) x hoi. hieu van coc luc gia thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ((ty nang) or (ty xang)) x hoi. hieu van coc luc gia thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ((ty nang) or (ty xang)) x hoi. hieu van coc luc gia thanh di cua tre*.