Perhaps you should try some spelling variations:
surface diffusion » state diffusion
information gain » information gap, information guide, information gathering
array profiling » array processing, microarray profiling
array imaging » arrays imaging, airway imaging, ray imaging
gain surface » grain surface, rain surface, brain surface
array using » arrays using

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: information gain surface diffusion ((array using) or (((array imaging) or (array profiling))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information gain surface diffusion ((array using) OR (((array imaging) OR (array profiling)))).
• Adding a wildcard symbol may retrieve word variants: information gain surface diffusion ((array using) or (((array imaging) or (array profiling))))*.