Perhaps you should try some spelling variations:
"model factor" » "models factor", "model fast", "model factsr"
"dose factor" » "noise factor", "one factor", "mode factor", "dos_ factor", "dosa factor", "dos3 factor", "dose factsr"
"de factor" » "e factor", "mode factor", "de factores", "d_ factor", "da factor", "d3 factor", "de factsr"
"de faitor" » "de fair", "de fait", "de faits"
"de facto" » "d_ facto", "da facto", "d3 facto", "de facts"
"e fact" » "_ fact", "a fact", "3 fact"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((((((((("de factor") OR ("dose factor"))) OR ("de faitor"))) OR ("model factor"))) OR ("de facto"))) OR ("e fact")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((((\"de factor\") OR (\"dose factor\"))) or (\"de faitor\"))) or (\"model factor\"))) or (\"de facto\"))) or (\"e fact\"))".
• Removing quotes may allow a broader search: (((((((((( de factor ) OR ( dose factor ))) or ( de faitor ))) or ( model factor ))) or ( de facto ))) or ( e fact )).
• Adding a wildcard symbol may retrieve word variants: (((((((((("de factor") OR ("dose factor"))) or ("de faitor"))) or ("model factor"))) or ("de facto"))) or ("e fact"))*.