Yess you can increase but for this you need the following things
Sd card greater than class 4 (Class 10 is preferred)
Partioning tool in PC
This guide will partition your sdcard to make a part of your sdcard works like the internal memorythat you can move your apps to it.
This guide will never increase the real internal memory (Storage in taskmanger) as it is impossible to be done.
you have to do is to partition your SD Card and for doing this you have to: Download Mini tool Partition.
2- Install the application on your PC and connect your SD card to your PC with Card Reader.
3- Open Mini Tool Partition in your PC and when the wizards open click on your SD Card and select Delete option. !!!(Note: This will format your SD Card completely mean that it will erase your data permanently, so before doing this backup your data at any place in PC or other Storage device.) When the Formatting of your SD Card is completed then, you have whole of space of your SD Card as unallocated
4- then Right click SD Card and select create option. A popup box will open giving you options for making partition; select the partition as primary and file
system as FAT if SD Card is less than 4GB or FAT32 if your SD Card is more than 4GB. Leave about 512 MB or more space (your choice) for creating the next partition.
5- Then select done and do right click on unallocated space of your SD Card and again click create option. Select Primary partition but change the file
system to Ext2, Ext3 or Ext4. Note: (Ext2 is recommended as most ROMs work fine with it). Click Apply Changes and then process goes on for the few minutes and then partition is completed.
6- Install Link2sd from Google Play On the first launch of the app, it will ask for root permissions and then, it will ask you the file system of the .ext partition that you had earlier made, choose the option as you had choose in the partitioning steps.
Sort the apps according to size and start linking them and then you have done your task.
Now you have your Phone’s Internal Memory+ Ext file size made by you in your SD Card. Now you can move your apps from your device memory to SDCard and simultaneously your device speed will also be increased.