@kamlesh_vaghela, instead of using <init> section, I would use submit button so that search runs when user confirms after providing both model and make.
<fieldset submitButton="false">
I would also add depends to row, so that row is displayed only when both tokens are present.
<row depends="$tkn_make$,$tkn_model$">
Finally, the search query should filter results as early as possible which would be in the base search i.e.
<query>
<YourBaseSearch> Make="$tkn_make$" Model="$tkn_model$" | <YourRemainingSearch>
</query>
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