Perhaps you should try some spelling variations:
"preprocessing methodsss involves" » "preprocessing methods involves" (Expand Search), "processing methods involves" (Expand Search), "preprocessing methodology involves" (Expand Search), "preprocessing methodssss involves" (Expand Search), "prepromising methodsss involves" (Expand Search), "prepreprocessing methodssss involves" (Expand Search)
"processing method solves" » "processing methods solves" (Expand Search), "promising method solves" (Expand Search), "preprocessing methods solves" (Expand Search), "processing method solve" (Expand Search), "processing method solved" (Expand Search), "processing method solvents" (Expand Search)

You may be able to get more results by adjusting your search query.

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