If you have more than one site in the same account, still, only one ad will show.
To have multiple sites display ads for the same search result, you need multiple accounts.
That being said, read the Google TOS carefully. Trying to put up duplicate sites so that you can have more AdWords exposure is one of the reasons Google will disable accounts.
If you're unsure if they are similar or very different sites, give Google a call before setting up your accounts to make sure there won't be a problem with advertising the 3 sites in 3 different accounts.
Really, eWhisper's suggestion (quoted below) is excellent, and probably the only way to know in advance what the best options are for your exact situation.
If you're unsure if they are similar or very different sites, give Google a call before setting up your accounts to make sure there won't be a problem with advertising the 3 sites in 3 different accounts.
AWA
but i own the three domains in my own name , my account is in my name with another name credit card.
but any way i believe that many people have as me two or three or more web sites in the same category , how they do?
for myself the category is horoscope.
Some people sell hosting and have may web sites , how they do?