Perhaps you should try some spelling variations:
"element modeling algorithm" » "element scheduling algorithm" (Expand Search), "elements modeling algorithm" (Expand Search)
"fragment based algorithm" » "agent based algorithm" (Expand Search), "gradient based algorithm" (Expand Search)
"element rast algorithm" » "element jaya algorithm" (Expand Search), "element rd algorithm" (Expand Search), "elements rast algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("element modeling algorithm") OR ((("fragment based algorithm") OR ("element rast algorithm"))))~.
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• Removing quotes may allow a broader search: (( element modeling algorithm ) OR ((( fragment based algorithm ) OR ( element rast algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("element modeling algorithm") OR ((("fragment based algorithm") OR ("element rast algorithm"))))*.