Perhaps you should try some spelling variations:
"image processing algorithm" » "image processing algorithms" (Expand Search)
"image modeling algorithm" » "image scheduling algorithm" (Expand Search)
"element tree algorithms" » "elements tree algorithms" (Expand Search), "element three algorithms" (Expand Search), "element free algorithms" (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: (("element tree algorithms") OR ((("image processing algorithm") OR ("image modeling algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"element tree algorithms\") OR (((\"image processing algorithm\") OR (\"image modeling algorithm\"))))".
• Removing quotes may allow a broader search: (( element tree algorithms ) OR ((( image processing algorithm ) OR ( image modeling algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("element tree algorithms") OR ((("image processing algorithm") OR ("image modeling algorithm"))))*.