Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
donor integration » der integration, cover integration, einer integration
supply great » supply growth, supply gap
supply donor » supply food
supply gas » supply gap, supply case, supply a

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((supply great) OR (supply gas)) integration study. ) or ( supply donor integration theories. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((supply great) OR (supply gas)) integration study. ) OR ( supply donor integration theories. )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((supply great) OR (supply gas)) integration study. ) or ( supply donor integration theories. ))".
• Adding a wildcard symbol may retrieve word variants: (( ((supply great) OR (supply gas)) integration study. ) or ( supply donor integration theories. ))*.