You could always make your own.
Doubting will not help your spell to manifest.
Belief in yourself is key, along with directing your Will.
I find the proof to be in the results of the manifestion of the working.
Well, I can tell you this, when I need to perform a working I have gotten results. Some workings take longer than others to manifest however.
No, I do not have any spells to recommend, as I do not know what your prior knowledge of magick or the basics may be, nor do I know what you may be looking for.
The ones I create myself. ^_^
I do not perform spells too often, as they aren't always needed.
Very rarely will I ever need to use one.
It just isn't really something that I include in my practice very often, if at all.