Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
than cua » nhan cua, thai cua, ban cua
duc ban » duc tan, duc van, dua ban
bao duc » dao duc, bao luc, cao duc
van bao » van ban, van dao
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sac ky) or (sach y)) ((nang xa) or (lang xa)) hoi. hieu van bao duc ban thanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sach y)) ((nang xa) OR (lang xa)) hoi. hieu van bao duc ban thanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sach y)) ((nang xa) or (lang xa)) hoi. hieu van bao duc ban thanh than cua tre*.