Perhaps you should try some spelling variations:
"case modeling algorithm" » "case making algorithm" (Expand Search), "based modeling algorithm" (Expand Search), "data modeling algorithm" (Expand Search), "a modeling algorithm" (Expand Search)
"element method algorithm" » "element network algorithm" (Expand Search), "element means algorithm" (Expand Search), "element mean algorithm" (Expand Search)
"elements ppo algorithm" » "elements pso algorithm" (Expand Search), "elements two algorithms" (Expand Search), "elements _ algorithm" (Expand Search), "elements ppm algorithm" (Expand Search), "elements upon algorithm" (Expand Search)

Try widening your search to All Fields.

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