Perhaps you should try some spelling variations:
"modified objective optimisation algorithm" » "modified objective optimization algorithm", "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective estimation algorithms"
"modified passive ventilation algorithm" » "modified passive estimation algorithm", "modified passive estimation algorithms", "modified passive evolution algorithm", "modified adaptive ventilation algorithm", "modified invasive ventilation 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 passive ventilation algorithm") OR ("modified objective optimisation algorithm"))~.
• Removing quotes may allow a broader search: (( modified passive ventilation algorithm ) or ( modified objective optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified passive ventilation algorithm") or ("modified objective optimisation algorithm"))*.