Perhaps you should try some spelling variations:
communication documentation » communication foundation, communication communication, communication conversation
documentation cluster » documentation center, documentation chapter, documentation centers
dispersion laser » dispersion based, dispersion linear, dispersion losses
dispersion use » dispersion using, dispersion based, dispersions case

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication documentation cluster ((dispersion use) OR (dispersion laser)) five~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "communication documentation cluster ((dispersion use) OR (dispersion laser)) five".
• Adding a wildcard symbol may retrieve word variants: communication documentation cluster ((dispersion use) OR (dispersion laser)) five*.