Combining Mantras can have harmful effects
Some people say that the seed Mantras like Aum, Haym, Kleem, etc can be combined. However this is NOT RECOMMENDED without guidance from a Guru.
Combining and mixing mantras is very very dangerous. Imagine combining a random set of chemicals in order to combine their advantages. What happens ultimately? Nobody knows!
Similar it is with combining and mixing mantras. Mantras are very useful if chanted rightly, but they can be very dangerous if not! That is why it is safe to chant mantras which one knows and also better yet chant the mantra under guidance of one's Guru.
The Kshama Prarthana is chanted by some devotees after recitation just to expiate the possible harmful effects of wrongly chanting mantras. Imagine then combining them?
God will Himself take care of the one who has surrendered to Him
However there is an easier way to achieve the same effect that you need. You want money, friends, a lover and all resistance and obstacles removed. The best solution for that is to surrender all of these and control over your life to God (you can call him by any name you want - Sri Krishna, Rama, Lord Shiva, Lord Vishnu, etc [Gita 10:20]).
But those who worship Me with devotion, meditating on My transcendental form--to them I carry what they lack and preserve what they have.