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
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cao duc » cao suc, giao duc, tao duoc
dao duc » giao duc, tao duoc
cua tre » cua te, cuu tre, cua triet
xang x » nang x
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: su sach ty xang x hoi. lieu va ((cao duc) OR (dao duc)) va thanh vai ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang x hoi. lieu va ((cao duc) OR (dao duc)) va thanh vai ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty xang x hoi. lieu va ((cao duc) OR (dao duc)) va thanh vai ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su sach ty xang x hoi. lieu va ((cao duc) OR (dao duc)) va thanh vai ((cua tre) or (cua viet))*.