Perhaps you should try some spelling variations:
"modified adaptive quantization algorithms" » "modified adaptive estimation algorithms", "modified adaptive ventilation algorithms", "modified passive quantization algorithms"
"defined network optimization algorithms" » "defined network optimisation algorithm", "defined network estimation algorithms", "defined network estimation 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 adaptive quantization algorithms") or ("defined network optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified adaptive quantization algorithms") OR ("defined network optimization algorithms")).
• Removing quotes may allow a broader search: (( modified adaptive quantization algorithms ) or ( defined network optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified adaptive quantization algorithms") or ("defined network optimization algorithms"))*.