Perhaps you should try some spelling variations:
developing underlying » developing modelling, developing ordering, developing under
underlying problems » underlying problem
innovation state » innovation space, innovation strategy, innovation system
innovation rate » innovation race, innovation create, innovation re
notation save » notation rate, notation part

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: ((notation save) OR (((innovation rate) OR (innovation state)))) developing underlying problems.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((notation save) or (((innovation rate) OR (innovation state)))) developing underlying problems.~".
• Adding a wildcard symbol may retrieve word variants: ((notation save) or (((innovation rate) OR (innovation state)))) developing underlying problems.*.