Perhaps you should try some spelling variations:
"light processing algorithm" » "light processing algorithms" (Expand Search), "signal processing algorithm" (Expand Search), "text processing algorithm" (Expand Search), "melt processing algorithm" (Expand Search)
"image processing algorithm" » "image processing algorithms" (Expand Search)
"sediment em algorithm" » "sediment deer algorithm" (Expand Search)

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