Perhaps you should try some spelling variations:
ventilation algorithm » estimation algorithms, evolution algorithm
changing estimation » channel estimation, charging station
passive ventilation » adaptive ventilation, invasive ventilation
modified changing » modified caging
modified passive » modified adaptive

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( modified changing estimation algorithm ) OR ( modified passive ventilation algorithm ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified changing estimation algorithm ) OR ( modified passive ventilation algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( modified changing estimation algorithm ) OR ( modified passive ventilation algorithm ))*.