Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
ban thanh » ban hanh, ban hang
cac khoi » cac thoi, cac khoan, cach thoi
mai khoi » mai khoa, tai khoa, dai khoa
hoi cuu » hoi chu, hoi cua, ho cuu
dua ban » dia ban, cua ban, qua ban
cam dua » ca dua, cay dua, chay dua
hieu ve » hieu va, hieu van
sach ky » sac ky, sach ty, sach kem
cuu tre » cua tre, cau tren, cau treo
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 ((mai khoi) or (cac khoi)). hieu ve cam dua ban thanh hoi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ((mai khoi) OR (cac khoi)). hieu ve cam dua ban thanh hoi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) nang ((mai khoi) or (cac khoi)). hieu ve cam dua ban thanh hoi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) nang ((mai khoi) or (cac khoi)). hieu ve cam dua ban thanh hoi cuu tre*.