Perhaps you should try some spelling variations:
"elements mining algorithm" » "elements finding algorithm" (Expand Search), "elements making algorithm" (Expand Search), "elements training algorithms" (Expand Search), "elements during algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level modeling algorithm" (Expand Search), "level finding algorithm" (Expand Search), "level according algorithm" (Expand Search), "level using algorithm" (Expand Search)
"present study algorithm" » "present wsindy algorithm" (Expand Search), "present td3 algorithm" (Expand Search), "present seu algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("present study algorithm") OR ((("elements mining algorithm") OR ("level coding algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"present study algorithm\") OR (((\"elements mining algorithm\") OR (\"level coding algorithm\"))))".
• Removing quotes may allow a broader search: (( present study algorithm ) OR ((( elements mining algorithm ) OR ( level coding algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("present study algorithm") OR ((("elements mining algorithm") OR ("level coding algorithm"))))*.