Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
thanh di » thanh de, thanh do, thanh dinh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
xuc van » duc van, luc van, xuc ban
ly vang » ly hang, ly van, ly quang
cua tre » cua te, cuu tre, cua triet

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