Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
dieu cua » dieu tra
cam thuc » am thuc, nam thuc, cam thu
sach ty » sach y, sach tu, sach thu
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu va » lieu va, hieu qua
mang xa » lang xa, mang may, dang xay
ty mang » ty xang, ty hang, tin mang
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty mang xa hoi. hieu va cam thuc ((((va hanh) or (va danh))) or (van thanh)) dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty mang xa hoi. hieu va cam thuc ((((va hanh) OR (va danh))) OR (van thanh)) dieu cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty mang xa hoi. hieu va cam thuc ((((va hanh) or (va danh))) or (van thanh)) dieu cua tre*.