If I have only the token and token_secret can I use this method https://dev.twitter.com/docs/api/1.1/get/search/tweets ? If I must retrieve Verifier, how can I retrieve this?
The oauth_verifier is only needed to negotiate an access token.
If you have a consumer key and a consumer secret, you can either negotiate user-based access tokens with them or negotiate a bearer token that represents only your application.