Perhaps you should try some spelling variations:
ash reserves » cash reserves, gas reserves, bank reserves
base series » based series, case series, base queries
sand soils » sandy soils, sands soils, sand boils
land soils » land soil, upland soils, sandy soils
soil base » soil based, soil case, soils based

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: (( ((sand soils) OR (land soils)) ash reserves ) OR ( soils soil base series )).
• Adding a wildcard symbol may retrieve word variants: (( ((sand soils) or (land soils)) ash reserves ) or ( soils soil base series ))*.