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)
"present ddpg algorithms" » "present ddpg algorithm" (Expand Search), "present mdem algorithms" (Expand Search), "present de algorithms" (Expand Search), "present day algorithms" (Expand Search), "present data algorithms" (Expand Search)
"element data algorithm" » "element data algorithms" (Expand Search), "element update algorithm" (Expand Search), "element atlas algorithm" (Expand Search), "settlement data algorithm" (Expand Search), "relevant data algorithm" (Expand Search), "movement data algorithm" (Expand Search)

Try widening your search to All Fields.

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