Perhaps you should try some spelling variations:
"data processing algorithm" » "data processing algorithms" (Expand Search)
"post processing algorithm" » "post processing algorithms" (Expand Search), "text processing algorithm" (Expand Search)
"element model algorithm" » "element mould algorithm" (Expand Search), "elements model algorithm" (Expand Search)

Try widening your search to All Fields.

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

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