Perhaps you should try some spelling variations:
continuity hypothesis » contact hypothesis, utility hypothesis
continuous synthesis » continuum synthesis, discontinuous synthesis, continents synthesis
continuum » continued, continue, continues

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• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((continuity hypothesis) OR (continuum hypothesis)) ) OR ( continuous synthesis )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((continuity hypothesis) OR (continuum hypothesis)) ) or ( continuous synthesis ))".
• Adding a wildcard symbol may retrieve word variants: (( ((continuity hypothesis) OR (continuum hypothesis)) ) or ( continuous synthesis ))*.