Hi,
I would like to ask,
does adding more voltage (or instead of using 3.3v battery use 5v ) adds more power to your module,
I'm talking about nRF24L01+ transceiver module is it possible for me to add more power to this module?
please..

 

and I forgot can I use a yagi Antenna to maximize it's range. and if yes may I ask how long (not the elements)
I was aiming for at least 2km.

 

No. Read the data sheet.
Max supply voltage is 3.6V.
Typical range is 100m. If you want to increase the range to 1000m, read this:

https://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo