Perhaps you should try some spelling variations:
"continuous hypothesis" » "continuum hypothesis", "continuity hypothesis", "continuous hyperthermic"
"continuum hypotheses" » "continuum hypothesis", "kontinuum hypothese", "continuity hypothesis"
"continuous synthesis" » "continuum synthesis", "discontinuous synthesis", "continuous systems"
"continents synthesis" » "contents synthesis", "components synthesis", "content synthesis"

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

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