Perhaps you should try some spelling variations:
"linac based level optimization algorithm" » "linac based global optimization algorithm" (Expand Search), "linac based based optimization algorithm" (Expand Search)
"binary camera dog optimization algorithm" » "binary camera _ optimization algorithm" (Expand Search), "binary camera igdt optimization 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: (("binary camera dog optimization algorithm") OR ("linac based level optimization algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"binary camera dog optimization algorithm\") OR (\"linac based level optimization algorithm\"))".
• Removing quotes may allow a broader search: (( binary camera dog optimization algorithm ) OR ( linac based level optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("binary camera dog optimization algorithm") OR ("linac based level optimization algorithm"))*.