Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
cham duc » pham duc, cham soc, pham duy
ve cham » va cham, ve chat, vu cham
tang ma » tang van
cua tre » cuu tre, cua triet, dua tren
hieu ve » hieu va, hieu van
duc ban » duc tan, duc van, dua ban
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
cua te » cua tu

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

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