Perhaps you should try some spelling variations:
communication documentation » communication foundation, communication communication, communication conversation
documentation center » documentation centres, documentation fast
dispersion based » diversion based, inversion based, dispersion janet
dispersion laser » dispersion linear, dispersion losses, dispersion poster

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 center ((dispersion based) OR (dispersion laser)) them~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "communication documentation center ((dispersion based) OR (dispersion laser)) them".
• Adding a wildcard symbol may retrieve word variants: communication documentation center ((dispersion based) OR (dispersion laser)) them*.