Perhaps you should try some spelling variations:
"light processing algorithm" » "signal processing algorithm" (Expand Search), "post processing algorithm" (Expand Search), "time processing algorithm" (Expand Search)
"element tree algorithms" » "element three algorithms" (Expand Search), "element other algorithms" (Expand Search), "element art algorithms" (Expand Search), "element ree algorithms" (Expand Search), "element te algorithms" (Expand Search), "elements ree algorithms" (Expand Search)
"element tide algorithm" » "element td3 algorithm" (Expand Search), "element leiden algorithm" (Expand Search), "element five algorithms" (Expand Search), "element te algorithm" (Expand Search), "element model algorithm" (Expand Search), "element study algorithm" (Expand Search)

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