Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu sach
ty nang » ty xang, ty hang, ly nang
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
cua tre » cua te, cuu tre, cua triet
va dau » va dao
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: su sach ((ty nang) or (ky nang)) xa hoi. lieu va dau tuc van thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ky nang)) xa hoi. lieu va dau tuc van thanh di cua tre*.