Chained Taxonomies filter

Please Answer:

I have created a city pin code database website. It has taxonomies State, District, City. I need Chained Taxonomy search. I have Created a search page pincodes.forinfo.in/search , but the taxonomies are not chained (linked) , It show all cities in dropdown, not particular selected state or district.

I want when the user select a particular state and the next option district should be within the State not all states, and in the same way when the user select a particular district the next option cities should Be within the district.

Please help me I have googled from last two Months from last two months but not found any solution.

https://wordpress.org/plugins/search-filter/