Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
nang xay » dang xay, nganh xay, nang xuan
su sach » so sach, vu sach
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thuat
xay hoi » xa hoi, tay hoi, cay phoi

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