Perhaps you should try some spelling variations:
"binary base igdt optimization algorithm" » "binary base _ optimization algorithm" (Expand Search), "binary case igdt optimization algorithm" (Expand Search)
"linac based based optimization algorithm" » "linac cased cased optimization algorithm" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("binary base igdt optimization algorithm") OR ("linac based based optimization algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"binary base igdt optimization algorithm\") OR (\"linac based based optimization algorithm\"))*".
• Removing quotes may allow a broader search: (( binary base igdt optimization algorithm ) OR ( linac based based optimization algorithm ))*.