autocorrect - odd corrections

Has anyone else suffered with the Autocorrect feature in Pages inserting nonsense?

In particular, if I use names - rather than mark the name as an unknown word (i.e. red underline), these are regularly turned into complete nonsense. I have just, for example, created a document in which one of the parties is called Chell, which Pages is determined to turn into 'hCell'.

This is commonplace, in my experience.

The pseudo-words inserted are complete rubbish, often with capitals in the wrong place etc.

Is there some way of editing the .plist of autocorrect entries or eliminating the rubbish entries (I know that what constitutes a 'rubbish' entry is a matter of judgment, but there are lots of pseudowords that Pages tries to impose on my text like the example given above)

Or is there somewhere from which I can download and install a more 'normal' autotext .plist?

Thanks

Dr F