Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach ty, sach kem
cao hoc » co hoc, cho hoc, chat hoc
van cam » van nam, van lam, van cau
xuc ban » duc ban, cuc ban, quoc ban
cuc tre » duc tre, cuu tre, cuc thue
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach y)) nang cao hoc. hieu van cam xuc ban thanh tai ((cuc tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang cao hoc. hieu van cam xuc ban thanh tai ((cuc tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang cao hoc. hieu van cam xuc ban thanh tai ((cuc tre) or (cua tre))*.