motor mounts finds documents containing 'motor' or 'mounts' references to 'motor mouth' would show up references to 'shock mounts' would show up
	motor or mounts same as above
	motor and mounts finds documents containing both 'motor' and 'mounts' finds all pages containing 'motor mounts' (which is what you want) references to 'starter motor' would not show up references to 'the posse mounts up' would not show up
	motor not mounts finds documents containing 'motor' but not 'mounts' would find any page with the word 'motor' in it, except those on 'motor mounts'
	(fuel not fires) and ECU finds documents containing 'ECU', plus anything on fuel that doesn't pertain to fires
	sub*
	finds all documents containing words starting with 'sub' 'subframe', 'subliminal', 'subterfuge' ... all references starting with 'sub'