> db.test.find({$or: [{Description: {$regex: '^225/65R16'}, Brand: {$regex: '^Hankook'}}]})
{ "Description" : "225/65R16 71T K715", "Brand" : "Hankook", "Ref" : 123455 }
{"Description" : "225/65R16 94T", "Brand" : "Hankook", "Ref" : 123455 }

> db.test.find({$or: [{Description: {$regex: '^225'}, Brand: {$regex: '^Han'}}]})
{ "Description" : "225/65R16 71T K715", "Brand" : "Hankook", "Ref" : 123455 }
{ "Description" : "225/65R16 94T", "Brand" : "Hankook", "Ref" : 123455 }