Perhaps you should try some spelling variations:
"element method algorithm" » "element mould algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level colony algorithm" (Expand Search), "level scheduling algorithm" (Expand Search)
"elements ppm algorithm" » "elements rd 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 ppm algorithm") OR ((("element method algorithm") OR ("level coding algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"elements ppm algorithm\") OR (((\"element method algorithm\") OR (\"level coding algorithm\"))))".
• Removing quotes may allow a broader search: (( elements ppm algorithm ) OR ((( element method algorithm ) OR ( level coding algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("elements ppm algorithm") OR ((("element method algorithm") OR ("level coding algorithm"))))*.