Perhaps you should try some spelling variations:
"melt processing algorithm" » "melt processing algorithms" (Expand Search), "text processing algorithm" (Expand Search), "image processing algorithm" (Expand Search)
"level using algorithm" » "level cosine algorithm" (Expand Search), "level fusion algorithm" (Expand Search)
"elements rf algorithm" » "elements rd algorithm" (Expand Search), "elements _ algorithms" (Expand Search), "elements _ algorithm" (Expand Search)

Try widening your search to All Fields.

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