Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
ly quang » le quang, vu quang
va thanh » gia thanh, va tinh, le thanh
van cao » van dao, van bao, van hao
cao duc » dao duc, cao suc, giao duc
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
va cua » va chua, via cua, ca cua
cua te » cua tu
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 ((ty nang) or (ly quang)) x hoi. hieu van cao duc ((va thanh) or (ban thanh)) va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ly quang)) x hoi. hieu van cao duc ((va thanh) OR (ban thanh)) va cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ly quang)) x hoi. hieu van cao duc ((va thanh) or (ban thanh)) va cua te*.