Perhaps you should try some spelling variations:
"system modeling algorithm" » "system making algorithm" (Expand Search), "system model algorithm" (Expand Search), "system models algorithm" (Expand Search)
"data backing algorithm" » "data tracking algorithm" (Expand Search), "data making algorithm" (Expand Search), "data tracking algorithms" (Expand Search)
"movement data algorithm" » "movement data algorithms" (Expand Search), "movement update algorithm" (Expand Search), "movement atlas algorithm" (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("data backing algorithm") OR ("system modeling algorithm"))) OR ("movement data algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"data backing algorithm\") OR (\"system modeling algorithm\"))) OR (\"movement data algorithm\"))".
• Removing quotes may allow a broader search: (((( data backing algorithm ) OR ( system modeling algorithm ))) OR ( movement data algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("data backing algorithm") OR ("system modeling algorithm"))) OR ("movement data algorithm"))*.