I wrote a Data Explorer query that does this. You can search the body of answers given to your questions. As the data explorer gets updated weekly, this is a workable solution till advanced search gets an update (if).
It can also handle upper and lower limits for vote count of answers.
Update :
Now also handles accepted status of answers! (Enter 0 in AcceptedAnswer when searching for all answers and 1 when searching for accepted answers)
Update #2:
Now question tags can also be searched! (Leave QuestionTags as is, if you dont want to use this)