Perhaps you should try some spelling variations:
ban hang » ngan hang
cham duc » cham soc, pham duy, phan duc
ca viet » va viet, co viet, hoa viet
hang vi » hang va, hanh vi, hang di
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
tu sac » tu sach, tu cac, tu san
vi ca » vit ca, li ca, va ca

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

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