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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("computers applied. in life science") OR ((("computer simple. in fire science") OR ("complex simple. in fire science")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"computers applied. in life science\") or (((\"computer simple. in fire science\") OR (\"complex simple. in fire science\"))))".
• Removing quotes may allow a broader search: (( computers applied. in life science ) or ((( computer simple. in fire science ) OR ( complex simple. in fire science )))).
• Adding a wildcard symbol may retrieve word variants: (("computers applied. in life science") or ((("computer simple. in fire science") OR ("complex simple. in fire science"))))*.