Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thuoc ban » thuoc tan, thuoc dang, thu ban
nam thuoc » nam thuc, nam thu, nha thuoc
thanh di » thanh doi, thanh de, thanh do
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve nam » he nam, va nam, le nam
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, 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: su ((sach ky) or (sac ky)) ((nang xa) or (nang ma)) hoi. hieu ve nam thuoc ban thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) ((nang xa) OR (nang ma)) hoi. hieu ve nam thuoc ban thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) ((nang xa) or (nang ma)) hoi. hieu ve nam thuoc ban thanh di cua tre*.