Perhaps you should try some spelling variations:
"Power electronics and applications specifics" » "Power electronics and applications specific", "Power electronics and application specific", "Power electronics and applications specified", "Power electronic and applications specifics"
"power electronics and applications series" » "power electronics and applications services", "power electronics and applications serious", "power electronics and applications queries", "power electronic and applications series"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("power electronics and applications series") OR ("Power electronics and applications specifics")).
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