Perhaps you should try some spelling variations:
"drone routing algorithm" » "drone cosine algorithm" (Expand Search), "drone using algorithm" (Expand Search)
"element cscap algorithm" » "element cosine algorithm" (Expand Search), "elements cscap 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.

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