Perhaps you should try some spelling variations:
"modified objective estimation algorithms" » "modified objective estimation algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective allocation algorithms"
"machines using method algorithm" » "machines using mom algorithm", "machinery using method algorithm", "machines nursing methods algorithm", "machines focusing method algorithm", "machines using metal algorithm"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"machines using method algorithm\") OR (\"modified objective estimation algorithms\"))~".
• Removing quotes may allow a broader search: (( machines using method algorithm ) OR ( modified objective estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("machines using method algorithm") OR ("modified objective estimation algorithms"))*.