Perhaps you should try some spelling variations:
"connecting the aggregate health series" » "connecting the aggregate growth series", "connecting the aggregate debt series", "connecting the aggregate data series", "connecting the aggregate health services", "connecting the aggregate health service", "connecting the aggregate health surveys"
"Connecting the aggregate air services" » "Connecting the aggregate labor services", "Connecting the aggregate water services", "Connecting the aggregate data services", "Connecting the aggregate basic services", "Connecting the aggregate care services"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("connecting the aggregate health series") or ("Connecting the aggregate air services"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("connecting the aggregate health series") OR ("Connecting the aggregate air services")).
• Removing quotes may allow a broader search: (( connecting the aggregate health series ) or ( Connecting the aggregate air services )).
• Adding a wildcard symbol may retrieve word variants: (("connecting the aggregate health series") or ("Connecting the aggregate air services"))*.