Perhaps you should try some spelling variations:
cao thuc » cao thuoc, bao thuc, can thuc
nang van » dang van, tang van, lang van
dao cua » dai cua, day cua, dan cua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
tu sach » thu sach, su sach, tu cach
hieu va » lieu va, hieu qua
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
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) or (te sach)) ky nang van hoa. hieu va cao thuc ((va hanh) OR (va danh)) dao cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang van hoa. hieu va cao thuc ((va hanh) OR (va danh)) dao cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang van hoa. hieu va cao thuc ((va hanh) OR (va danh)) dao cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang van hoa. hieu va cao thuc ((va hanh) OR (va danh)) dao cua tre*.