Perhaps you should try some spelling variations:
san thanh » ban thanh, van thanh, son thanh
van nang » van quang, van ban, van dong
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nuoc san » nuoc luan, nguoi san, nuoc quan
thanh di » thanh doi, thanh de, thanh do
te sach » toc sach
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((y nang) or (van nang)) xa hoi. hieu van cac nuoc san thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (van nang)) xa hoi. hieu van cac nuoc san thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (van nang)) xa hoi. hieu van cac nuoc san thanh di cua tre*.