Perhaps you should try some spelling variations:
"experiments based algorithms" » "experiments showed algorithms" (Expand Search), "experimental basis algorithms" (Expand Search), "experimental case algorithms" (Expand Search), "experiments based 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)
"element tree algorithms" » "element three algorithms" (Expand Search), "element art algorithms" (Expand Search), "element two algorithms" (Expand Search), "element ree algorithms" (Expand Search), "element te algorithms" (Expand Search), "element ore algorithms" (Expand Search)

Try widening your search to All Fields.

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