Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
nang cho » nang chon, ngang cho, nang cao
tai cuu » tai cuc, tai buu, tai cua
can ban » van ban, toan ban
cac ban » cac dan, cac van, cac bai
cuu tre » cua tre, cau tren, cau treo
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
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 ty) or (sach y)) nang cho hoc. hieu ve cam ((cac ban) OR (can ban)) thanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang cho hoc. hieu ve cam ((cac ban) OR (can ban)) thanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang cho hoc. hieu ve cam ((cac ban) OR (can ban)) thanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang cho hoc. hieu ve cam ((cac ban) OR (can ban)) thanh tai cuu tre*.