Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dong hoa » dong hoc
chat cua » nhat cua, chat va, chat huu
thanh ca » thanh cha, thanh cac, thanh ha
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu tu » chieu tu, hieu tuc, hien tu
cua tre » cua te, cuu tre, cua triet
ca cua » co 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 ((dong hoa) or (dong co)) hoi. hieu tu ((chat cua) or (cam xuc)) ban thanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((dong hoa) OR (dong co)) hoi. hieu tu ((chat cua) OR (cam xuc)) ban thanh ca cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((dong hoa) or (dong co)) hoi. hieu tu ((chat cua) or (cam xuc)) ban thanh ca cua tre*.