Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
grid integration » trade integration, _ integration, data integration
can training » bank training, _ training, job training
supply grid » supply crowd, support grid
a training » _ training, re training, a trading

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply ((can training) OR (a training)) services. ) or ( supply grid integration theories. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply ((can training) OR (a training)) services. ) OR ( supply grid integration theories. ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( supply ((can training) OR (a training)) services. ) or ( supply grid integration theories. ))*".