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

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 ve 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 ve cam xuc ban thanh tai ((cuc tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) nang cao hoc. hieu ve 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 ve cam xuc ban thanh tai ((cuc tre) or (cua tre))*.