Perhaps you should try some spelling variations:
multifaceted research » multilevel research
multilayered research » multilevel research, multilayered reservoir
multipole reservoir » multiple reservoir, multiple reservoirs, multipurpose reservoir

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((multipole reservoir) OR (multifaceted research))) OR (multilayered research)).
• Adding a wildcard symbol may retrieve word variants: ((((multipole reservoir) or (multifaceted research))) or (multilayered research))*.