Perhaps you should try some spelling variations:
reduction techniques » reduction technique, imputation techniques
floatation technique » inhalation technique, implantation technique, imputation techniques
tool reduction » model reduction, h2o2 reduction
co floatation » _ floatation
based tool » based two
based co » based code, based no2, based two

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

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