Perhaps you should try some spelling variations:
multilayered reservoirs » multilayer reservoir, multilayered reflectors
multilayered reservoir » multilayered research
multiple reservoirs » multiple reservoir, multipole reservoir, multi reservoirs

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: ((((((multiple reservoirs) OR (multipurpose reservoir))) OR (multilayered reservoirs))) OR (multilayered reservoir)).
• Adding a wildcard symbol may retrieve word variants: ((((((multiple reservoirs) or (multipurpose reservoir))) or (multilayered reservoirs))) or (multilayered reservoir))*.