Perhaps you should try some spelling variations:
"computers applied. in fire science" » "computing applied. in fire science", "computer appl. in fire science", "computers applied. in file science", "computers applied. in five science", "computers applied. in firm science"
"computer people. in life science" » "computers people. in life science", "computer problem. in life science", "computer profile. in life science", "computer people. in life sciences"
"computer simple. in life science" » "computing simple. in life science", "complex simple. in life science", "computer some. in life science", "computer simple. in life sciences"
"computer apple. in fire science" » "computer appl. in fire science", "computer example. in fire science", "computing apple. in fire science", "computer apple. in file science", "computer apple. in five science", "computer apple. in firm science"

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