Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
x hoi » o hoi, x ho, 5 hoi

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 xang ((x hoi) OR (xa hoi)). lieu va cao duc va thanh vai ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang ((x hoi) OR (xa hoi)). lieu va cao duc va thanh vai ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang ((x hoi) OR (xa hoi)). lieu va cao duc va thanh vai ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang ((x hoi) OR (xa hoi)). lieu va cao duc va thanh vai ((cua tre) or (cua viet))*.