Perhaps you should try some spelling variations:
"_ optimized algorithms" » "_ optimized algorithm", "_ optimization algorithms"
"_ optimizer algorithms" » "_ optimized algorithm", "_ optimization algorithms", "_ optimize algorithms", "_ optimise algorithms"
"time approximation algorithms" » "one approximation algorithms", "_ approximation algorithms"

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: (((("_ optimized algorithms") OR ("_ optimizer algorithms"))) or ("time approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("_ optimized algorithms") OR ("_ optimizer algorithms"))) OR ("time approximation algorithms")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"_ optimized algorithms\") OR (\"_ optimizer algorithms\"))) or (\"time approximation algorithms\"))".
• Removing quotes may allow a broader search: (((( _ optimized algorithms ) OR ( _ optimizer algorithms ))) or ( time approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("_ optimized algorithms") OR ("_ optimizer algorithms"))) or ("time approximation algorithms"))*.