Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
danh dai » danh dau, danh di, danh sai
su sach » so sach, vu sach
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
va tham » van tham, va cham, va thuat
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky danh
cua tre » cua te, cuu tre, cua triet

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

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