You’re missing the name of the search text input, so replace:
name=""
with
name="s"
Then take a look at searchform.php
in the default themes, like Twenty Sixteen:
<form role="search" method="get" class="search-form" action="<?php echo esc_url( home_url( "https://wordpress.stackexchange.com/" ) ); ?>">
<label>
<span class="screen-reader-text"><?php echo _x( 'Search for:', 'label', 'twentysixteen' ); ?></span>
<input type="search" class="search-field" placeholder="<?php echo esc_attr_x( 'Search …', 'placeholder', 'twentysixteen' ); ?>" value="<?php echo get_search_query(); ?>" name="s" />
</label>
<button type="submit" class="search-submit"><span class="screen-reader-text"><?php echo _x( 'Search', 'submit button', 'twentysixteen' ); ?></span></button>
</form>
as an example for e.g. attribute escaping.
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