Hello Sudarsan,

Below steps are very help for search the product in variants

step-1: Select the Sales -> Products -> Product Variants.

step-2: Select search view which is right top side.

step-3: Select the Advanced Search filter.

step-4: Select the Product Attributes from selection then after condition can be select and after text the variants which you want and finally press Apply button. 

step-5: You will see this answer

Hope this is help full as you want.

Thanks & Regards

Ankit H Gandhi