Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
chat hoc » chat hoa, chat thom, cho hoc
cuc ban » cua ban, cac ban, cuu ban
cac cuc » cac cuoc, cac cua, cac nuoc
hieu ve » hieu va, hieu van
sach ky » sac ky, sach ty, sach kem
cao hoc » co hoc, cho hoc
cuc tre » duc tre, cua tre, cuu tre
ve cac » va cac, vien cac

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) OR (chat hoc)). hieu ve cac cuc ban thanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ((cao hoc) OR (chat hoc)). hieu ve cac cuc ban thanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang ((cao hoc) OR (chat hoc)). hieu ve cac cuc ban thanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang ((cao hoc) OR (chat hoc)). hieu ve cac cuc ban thanh tai cuc tre*.