Perhaps you should try some spelling variations:
"modified orcad optimization algorithms" » "modified orcad optimisation algorithm", "modified orcad estimation algorithms", "modified orcad estimation algorithm", "modified orca optimization algorithms"
"modified adaptive quantization algorithm" » "modified adaptive estimation algorithm", "modified adaptive ventilation algorithm", "modified passive quantization algorithm"

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: (("modified orcad optimization algorithms") or ("modified adaptive quantization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified orcad optimization algorithms") OR ("modified adaptive quantization algorithm")).
• Removing quotes may allow a broader search: (( modified orcad optimization algorithms ) or ( modified adaptive quantization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified orcad optimization algorithms") or ("modified adaptive quantization algorithm"))*.