Perhaps you should try some spelling variations:
"applied economic systems" » "applied economics systems", "applied econometrics systems", "applied ecology systems", "applied economic sectors"
"applied dynamical systems" » "applied dynamics systems", "applied dynamic systems"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("applied economic systems") OR ("applied dynamical systems")).
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