Perhaps you should try some spelling variations:
"uav tracking algorithms" » "uav learning algorithms" (Expand Search), "uav processing algorithms" (Expand Search), "_ tracking algorithms" (Expand Search)
"protein coding algorithm" » "protein cosine algorithm" (Expand Search), "protein colony algorithm" (Expand Search), "protein scheduling algorithm" (Expand Search)
"element method algorithm" » "element mould algorithm" (Expand Search), "elements method algorithm" (Expand Search)

Try widening your search to All Fields.

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