Perhaps you should try some spelling variations:
"computer example. in fire science" » "computer examples. in fire science", "computed example. in fire science", "computed examples. in fire science", "computer example. in file science", "computer example. in five science", "computer example. in firm science"
"computer apple. in fire science" » "computers applied. in fire science", "computer simple. in fire science", "computer people. in fire science", "computer appe. in fire science", "computer appse. in fire science", "computer apple. in file science", "computer apple. in five science", "computer apple. in firm science"
"computer appl. in life science" » "computer appl. in life sciences", "computer app. in life science", "computer apps. in life science"

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