Perhaps you should try some spelling variations:
reduction techniques » reduction technique, imputation techniques
floatation technique » inhalation technique, implantation technique, imputation techniques
3d reduction » _ reduction
based 3do2 » based no2
based 3d » based _, based co, based k

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 3d reduction techniques ) OR ( learning-based 3do2 floatation technique ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( learning-based 3d reduction techniques ) OR ( learning-based 3do2 floatation technique ))".
• Adding a wildcard symbol may retrieve word variants: (( learning-based 3d reduction techniques ) OR ( learning-based 3do2 floatation technique ))*.