Perhaps you should try some spelling variations:
"image processing algorithm" » "image modeling algorithm" (Expand Search), "image routing algorithm" (Expand Search), "image tracking algorithm" (Expand Search)
"element leiden algorithm" » "element learner algorithm" (Expand Search), "element kepler algorithm" (Expand Search), "element mean algorithm" (Expand Search)
"element based algorithm" » "engagement based 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: (("image processing algorithm") OR ((("element based algorithm") OR ("element leiden algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"image processing algorithm\") OR (((\"element based algorithm\") OR (\"element leiden algorithm\"))))".
• Removing quotes may allow a broader search: (( image processing algorithm ) OR ((( element based algorithm ) OR ( element leiden algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("image processing algorithm") OR ((("element based algorithm") OR ("element leiden algorithm"))))*.