Perhaps you should try some spelling variations:
reduction techniques » reduction technique, imputation techniques
floatation technique » inhalation technique, implantation technique, imputation techniques
co reduction » _ reduction, h2o2 reduction, closed reduction
based coo2 » based code, based no2, based tool
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 reduction techniques ) or ( learning-based coo2 floatation technique ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based co reduction techniques ) OR ( learning-based coo2 floatation technique )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based co reduction techniques ) or ( learning-based coo2 floatation technique ))*.