Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh va » thanh van, hanh va, thanh ha
cham duc » pham duc, cham soc, pham duy
cuu tre » cua tre, cau tren, cau treo
duc ban » duc tan, duc van, dua ban
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
va cuu » va cau, va chu, va huu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sach ty)) tang ((ma hoi) OR (mai hoi)). hieu ve cham duc ban thanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach ty)) tang ((ma hoi) OR (mai hoi)). hieu ve cham duc ban thanh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sach ty)) tang ((ma hoi) OR (mai hoi)). hieu ve cham duc ban thanh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sach ty)) tang ((ma hoi) OR (mai hoi)). hieu ve cham duc ban thanh va cuu tre*.