Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cac tuc » cac toc, cac tu, cac tac
va dinh » van dinh, va kinh, vu dinh
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
ca cua » co cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((le hoi) OR (ma hoa)). lieu va cac tuc ((va dinh) OR (va tinh)) ca cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((le hoi) or (ma hoa)). lieu va cac tuc ((va dinh) OR (va tinh)) ca cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((le hoi) or (ma hoa)). lieu va cac tuc ((va dinh) OR (va tinh)) ca cua tre*.