Perhaps you should try some spelling variations:
"improvements routing algorithms" » "improvements processing algorithms" (Expand Search), "improvement routing algorithms" (Expand Search)
"data using algorithm" » "data cosine algorithm" (Expand Search)
"element data algorithm" » "element jaya algorithm" (Expand Search), "element deer algorithm" (Expand Search), "elements data 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: (((("improvements routing algorithms") OR ("element data algorithm"))) OR ("data using algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"improvements routing algorithms\") OR (\"element data algorithm\"))) OR (\"data using algorithm\"))".
• Removing quotes may allow a broader search: (((( improvements routing algorithms ) OR ( element data algorithm ))) OR ( data using algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("improvements routing algorithms") OR ("element data algorithm"))) OR ("data using algorithm"))*.