Perhaps you should try some spelling variations:
"modified allocation approximation algorithms" » "modified allocation optimization algorithms"
"modified policy estimation algorithms" » "modified policy estimation algorithm", "modified policy optimization algorithms", "modified policy optimisation algorithm", "modified pose estimation algorithms", "modified motion estimation algorithms"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified allocation approximation algorithms") OR ("modified policy estimation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified allocation approximation algorithms\") OR (\"modified policy estimation algorithms\"))".
• Removing quotes may allow a broader search: (( modified allocation approximation algorithms ) OR ( modified policy estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified allocation approximation algorithms") OR ("modified policy estimation algorithms"))*.