Perhaps you should try some spelling variations:
communication communications » communication communication, communication communicating, communications communication
communications basic » communications based, communications banking, communications a
basic dimensions » based dimension, pacific dimensions, design dimensions
spl file » spss file, ip file, san file
pe file » jpeg file, aec file

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication communications basic dimensions ((pe file) OR (spl file))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "communication communications basic dimensions ((pe file) OR (spl file))".
• Adding a wildcard symbol may retrieve word variants: communication communications basic dimensions ((pe file) OR (spl file))*.