Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cao duc » dao duc, cao suc, giao duc
cuu tre » cua tre, cau tren, cau treo
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
cua te » cua tu
va cao » va cac, va co, va dao

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