Perhaps you should try some spelling variations:
states methodology » surveys methodology, sciences methodology
economic studies » economic status
aims methodology » aims methodological, 3 methodology, 2 methodology
studies united » sources united, states united, subsidies united
studies und » studien und, studie und, studies using
und aims » und abs

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• Performing a fuzzy search may retrieve terms with similar spellings: (( economic studies united states methodology ) or ( economic studies und aims methodology ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( economic studies united states methodology ) OR ( economic studies und aims methodology )).
• Adding a wildcard symbol may retrieve word variants: (( economic studies united states methodology ) or ( economic studies und aims methodology ))*.