Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
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: ((tu sach) OR (te sach)) ty nang x hoi. hieu va pham duc ((va danh) or (va dinh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty nang x hoi. hieu va pham duc ((va danh) OR (va dinh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ty nang x hoi. hieu va pham duc ((va danh) or (va dinh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ty nang x hoi. hieu va pham duc ((va danh) or (va dinh)) vai cua tre*.