Income tax return for assessment year for 2014-15 & 2015-16

"Can i take refund for the assessment  year 2014-15 & 2015-16 while file the return of AY 2016-17?"

No..........

You can file belated return for AY 2016-17 along with AY 2017-18....... to claim refund of particular assessment year.....

For AY 2014-15 & 2015-16 you can apply for condonation of delay of filing return with your Jurisdictional ITO for permission to file. Generally permission is granted. After that you can file those returns.......

(Can i take refund for the assessment  year 2014-15 & 2015-16)

You have any notice for NMS from ITD then you can file your returns. If any TDS amount available above said AY....