Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
ve cham » va cham, ve chat, vu cham
tai cuu » tai cuc, tai buu, tai cua
cuc ban » cua ban, cac ban, cuu ban
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach ty, sach kem
cao hoc » co hoc, cho hoc, chat hoc
ve cam » ve cac, va cam, ve cai

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) OR (ve cham)) cuc ban thanh tai cuu 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) OR (ve cham)) cuc ban thanh tai cuu 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) OR (ve cham)) cuc ban thanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang cao hoc. hieu ((ve cam) OR (ve cham)) cuc ban thanh tai cuu tre*.