Perhaps you should try some spelling variations:
"completed examples. in file science" » "complete examples. in file science", "complete example. in file science", "complexes examples. in file science", "completed examples. in files science", "completed examples. in fire science", "completed examples. in five science"
"computers applied. in life science" » "computing applied. in life science", "computer appl. in life science", "computers applied. in life sciences", "computers applied. in fire science"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("computers applied. in life science") OR ("completed examples. in file science")).
• Removing quotes may allow a broader search: (( computers applied. in life science ) or ( completed examples. in file science )).
• Adding a wildcard symbol may retrieve word variants: (("computers applied. in life science") or ("completed examples. in file science"))*.