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

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

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