Perhaps you should try some spelling variations:
multilayered reflectors » multilayered reflection, multilayer reflection, multilayer reflective
multilayered reservoir » multilayered research
multipole reservoir » multiple reservoir, multipurpose reservoir, multilayer reservoir
multiple reservoirs » multiple reservoir, multi reservoirs, multi 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 (multiple reservoirs))) OR (multilayered reflectors))) OR (multilayered reservoir)).
• Adding a wildcard symbol may retrieve word variants: ((((((multipole reservoir) or (multiple reservoirs))) or (multilayered reflectors))) or (multilayered reservoir))*.