Phone memory issue ( Xperia J)

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http://forums.androidcentral.com – hello all, i new with android..i have xperia J (rooted) so i look my xperia J have 3 storage..phone memory, internal storage, sd card i try to swap storage (internal<>sd) with edit "vold.fstab" method. i success, and now my internal is 32gb and sd 2gb (before internal 2gb, sd 32gb). the problem is : -sometime cannot install apps with error storage full -apps not install in internal (need move manually) (its ok) -cannot move certain apps from phone memory to internal. can i know if we can expand phone memory, because im understand apps still required phone memory even w (HowTos)