Perhaps you should try some spelling variations:
cuon sach » duong sach, cuoc cach, nuoc sach
cau thuc » cau truc, cuu thuc, can thuc
co sach » bo sach, hoc sach
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) OR (cuon sach)) ky dang xa hoi. hieu va cau thuc va danh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (cuon sach)) ky dang xa hoi. hieu va cau thuc va danh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) OR (cuon sach)) ky dang xa hoi. hieu va cau thuc va danh ((vai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((co sach) OR (cuon sach)) ky dang xa hoi. hieu va cau thuc va danh ((vai cua) or (hai cua)) tre*.