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
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cac luc » coc luc, cac nuoc, cac cuoc
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, 5 hoi

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 ty nang ((x hoi) OR (x ho)). hieu van ((cac luc) OR (cau luc)) gia thanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((x hoi) or (x ho)). hieu van ((cac luc) OR (cau luc)) gia thanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x hoi) or (x ho)). hieu van ((cac luc) OR (cau luc)) gia thanh di cua tre*.