Perhaps you should try some spelling variations:
reduction techniques » reduction technique, imputation techniques
floatation technique » inhalation technique, implantation technique, imputation techniques
co floatation » _ floatation
n reduction » _ reduction, _ prediction, _ production
based co » based code, based no2, based two
based n » based _, based k, based no2

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( learning-based n reduction techniques ) OR ( learning-based co floatation technique ))~".
• Adding a wildcard symbol may retrieve word variants: (( learning-based n reduction techniques ) OR ( learning-based co floatation technique ))*.