Perhaps you should try some spelling variations:
"image processing algorithm" » "image processing algorithms" (Expand Search)
"element sampling algorithm" » "element scheduling algorithm" (Expand Search)
"elements em algorithm" » "elements deer algorithm" (Expand Search), "elements _ algorithm" (Expand Search), "elementi per algorithm" (Expand Search)

Try widening your search to All Fields.

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