Perhaps you should try some spelling variations:
limitation techniques » imputation techniques, mitigation techniques, augmentation techniques
floatation technique » inhalation technique, implantation technique, imputation techniques
3do2 limitation » co limitation, food limitation
3d floatation » _ floatation
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 floatation technique ) OR ( learning-based 3do2 limitation techniques ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( learning-based 3d floatation technique ) OR ( learning-based 3do2 limitation techniques ))".
• Adding a wildcard symbol may retrieve word variants: (( learning-based 3d floatation technique ) OR ( learning-based 3do2 limitation techniques ))*.