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If you want to show block by specific terms each node in drupal 6.x. You can use php condition for display your block.

  1. Go to Administer > Sites building > Block
  2. Configure your block
  3. Open Page specific visibility settings > Show if the following PHP code returns TRUE (PHP-mode, experts only). and paste this code.

<?php
if (arg(0)=='node' && is_numeric(arg(1)) ) {
  $terms = taxonomy_node_get_terms(node_load(arg(1)));
  foreach($terms as $term) {
    if (in_array($term->name, array('term1_name', 'term2_name'))) {
      return TRUE;
    }
  }
}
return FALSE;
?>

NOTE: You can change $term->name (for term name) to $term->tid (for term id).

Special thanks: @noomz
More information: taxonomy_node_get_terms (api.drupal.org)
Related story: Display Block on a Specific Content Type in Drupal 6.x (musida.web.id)