Perhaps you should try some spelling variations:
integration theory » integration through, information theory, innovation theory
de integration » die integration, re integration, une integration
der motivation » zur motivation, die motivation, your motivation
de motivation » die motivation, do motivation, add motivation
support de » support _, support a, support 4

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

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