MAX232 circuit not working
MAX232 does not work with 3.3V supply voltage. You should either use MAX3232 (which is 3.3V equivalent part of MAX232) or you should supply 5V to your IC.

Besides that there is only one thing wrong with your circuit: You should connect (+) pin of C4 to GND not VCC.

For those who misinterpret the circuit:
Pins 2 and 6 are NOT the supply pins of the IC. They are respectively, positive and negative charge pump outputs for storage capacitors.