Perhaps you should try some spelling variations:
imputation techniques » implantation technique, augmentation techniques, segmentation techniques
simulation technique » inhalation technique, implantation technique, mitigation techniques
n simulation » _ simulation, a simulation, _ simulations
based nnode » based anode, based anodes, based code
based n » based _, based k, based no2

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