Perhaps you should try some spelling variations:
reduction techniques » reduction technique, imputation techniques
floatation technique » inhalation technique, implantation technique, imputation techniques
two reduction » h2o2 reduction, _ reduction
k floatation » _ floatation
based two » based tool, based co
based k » based _, based n, based 3d

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 two reduction techniques ) or ( learning-based k floatation technique ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based two reduction techniques ) OR ( learning-based k floatation technique )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based two reduction techniques ) or ( learning-based k floatation technique ))*.