Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
cao duc » dao duc, cao suc, giao duc
thi cuu » thi cuc, thi huu, thi cu
cuu tre » cua tre, cau tren, cau treo
va cao » va cac, va co, va bao
va dao » ca dao

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 ky ((nang xa) OR (nang x)) hoi. lieu va cao duc ((va dau) or (va dao)) thi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang x)) hoi. lieu va cao duc ((va dau) OR (va dao)) thi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) OR (nang x)) hoi. lieu va cao duc ((va dau) or (va dao)) thi cuu tre*".