Perhaps you should try some spelling variations:
information ppgis » information gis, information papers, information peggy
state diffusion » surface diffusion
array profiling » array processing, microarray profiling
array string » array strong, arrays strings, array sharing
ppgis state » perlis state, logics state

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

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