Perhaps you should try some spelling variations:
"oeconomische gedanken" » "technische gedanken", "soziologische gedanken", "economische gedachtes"
"economische gevolgen" » "okonomische folgen", "economische groei", "economische delicten"
"economische crises" » "economic crises", "economic crisis", "economic crimes"

Try widening your search to All Fields.

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: (("economische crises") OR ((("economische gevolgen") OR ("oeconomische gedanken")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"economische crises\") or (((\"economische gevolgen\") OR (\"oeconomische gedanken\"))))".
• Removing quotes may allow a broader search: (( economische crises ) or ((( economische gevolgen ) OR ( oeconomische gedanken )))).
• Adding a wildcard symbol may retrieve word variants: (("economische crises") or ((("economische gevolgen") OR ("oeconomische gedanken"))))*.