connecting oscillators in parallel to increase current
Good help in your comment Delta1X.  Now some help can be had.

In general, you can parallel any voltage source, as long as you take steps for them to share equally.  You might need to add buffer stage to the output of an oscillator. This would keep any loading effects from affecting the frequency of the oscillator. 

Additionally, you might need to use a small bit of resistance in series with the output of the buffered oscillator to help with sharing of the load on the oscillator.

If you get to specifics of oscillators,  more info can be had to help you. 

And as KAZ said,  if you buffer the oscillator, you only need one oscillator.