Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
va thanh » gia thanh, ban thanh, va tinh
thanh de » hanh de, thanh ve, thanh do
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
cuu tre » cua tre, cau tren, cau treo
de cuu » de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky tang xa hoi. hieu cua ((cac tuc) OR (cac tac)) va thanh de cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky tang xa hoi. hieu cua ((cac tuc) OR (cac tac)) va thanh de cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky tang xa hoi. hieu cua ((cac tuc) OR (cac tac)) va thanh de cuu tre*.