Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, dai khoa
thanh ho » thanh pho, thanh hoa, thanh hoc
cac khoi » cac thoi, cac khoan, cach thoi
te sach » toc sach
dua ban » cua ban, qua ban, mua ban
chu tre » cho tre, chu tri, cuu tre
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ho chu » hoi chu, cho chu, ho chua
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: te sach ky nang ((mai khoi) or (cac khoi)). hieu ve cam ((dua ban) OR (dia ban)) thanh ho chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((mai khoi) OR (cac khoi)). hieu ve cam ((dua ban) OR (dia ban)) thanh ho chu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((mai khoi) or (cac khoi)). hieu ve cam ((dua ban) OR (dia ban)) thanh ho chu tre*".