Perhaps you should try some spelling variations:
"pre processing algorithm" » "pre processing algorithms" (Expand Search), "_ processing algorithm" (Expand Search), "image processing algorithm" (Expand Search)
"elements method algorithm" » "elements mould algorithm" (Expand Search)
"relevant data algorithm" » "relevant jaya algorithm" (Expand Search), "relevant deer 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: (("elements method algorithm") OR ((("pre processing algorithm") OR ("relevant data algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"elements method algorithm\") OR (((\"pre processing algorithm\") OR (\"relevant data algorithm\"))))".
• Removing quotes may allow a broader search: (( elements method algorithm ) OR ((( pre processing algorithm ) OR ( relevant data algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("elements method algorithm") OR ((("pre processing algorithm") OR ("relevant data algorithm"))))*.