Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
co hoi » co hoc, co loi
va am » va lam, va cam

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) OR (ky nang)) co hoi. hieu va am thuc va danh ((vai cua) OR (hai cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ky nang)) co hoi. hieu va am thuc va danh ((vai cua) OR (hai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ky nang)) co hoi. hieu va am thuc va danh ((vai cua) OR (hai cua)) triet*.