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 firm science", "computers applied. in fine science"
"computer simple. in fire science" » "computing simple. in fire science", "complex simple. in fire science", "complete simple. in fire science", "computer simple. in file science", "computer simple. in firm science", "computer simple. in fine science"
"computer apple. in life science" » "computer appl. in life science", "computer example. in life science", "computer people. in life science", "computer apple. in life sciences"
"computer apple. in five science" » "computer appl. in five science", "computer example. in five science", "computer people. in five science", "computer apple. in sieve science", "computer apple. in wave science"

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