Now always ignoring short words in the search query to be able to always use index. Adding small search help docs.

src/Search/TorrentSearcher.php

@@ -7,6 +7,9 @@ use Doctrine\ORM\{Mapping\ClassMetadata, QueryBuilder};
 
 class TorrentSearcher
 {
+    /** Minimal word length to be used when searching in the database. */
+    public const MIN_PART_LENGTH = 3;
+
     private const ORDER_DISABLED_FIELDS = ['infoHash'];
 
     /** @var TorrentRepository */
@@ -73,6 +76,20 @@ class TorrentSearcher
         $query = trim($query);
         $query = preg_replace('/\s+/', ' ', $query);
 
-        return explode(' ', $query);
+        $parts = explode(' ', $query);
+
+        return $this->removeShortParts($parts);
+    }
+
+    /**
+     * @param string[] $words
+     *
+     * @return string[]
+     */
+    private function removeShortParts(array $words): array
+    {
+        return array_filter($words, function (string $word) {
+            return mb_strlen($word) >= self::MIN_PART_LENGTH;
+        });
     }
 }

templates/base.html.twig

@@ -52,9 +52,16 @@
                        {% if 'index' == app.request.get('_route') %}autofocus{% endif %} />
                 <div class="input-group-append">
                     <button class="btn btn-outline-primary my-2 my-sm-0" type="submit"><i class="fas fa-search"></i> Search</button>
+                    <button class="btn btn-outline-info" type="button" data-toggle="collapse" data-target="#search-rules" aria-expanded="false" aria-controls="search-rules">
+                        <i class="fa fa-question-circle"></i>
+                    </button>
                 </div>
             </div>
         </form>
+
+        <div class="alert alert-info collapse" role="alert" id="search-rules">
+            {{ include('search_rules_help.html.twig') }}
+        </div>
     </div>
     {% endif %}
 

templates/search_rules_help.html.twig

@@ -0,0 +1,19 @@
+<p>
+    Use words consisting of <strong>{{ constant('\\App\\Search\\TorrentSearcher::MIN_PART_LENGTH') }}+</strong> characters.
+    Shorter words will be <u>ignored</u>.
+</p>
+<p>
+    The search will find torrents containing <strong>all</strong> words you used <u>regardless of their order and case</u>.
+</p>
+<p>
+    Examples: <br/>
+    Use <code>pirates silicon valley</code> if you want to find "Pirates of Silicon Valley". Note that <code>of</code> will be ignored even
+    if you use it in the query. <br/>
+    Use <code>some series s08e10</code> if you want to find specific episode of some season of TV show. <br/>
+    Use <code>some series season</code> if you want to find full season. <br/>
+    It's also useful to use popular keywords if you want to find specific quality or format: <br/>
+    <code>some show 2160 265</code> should be enough to find what you need in 4k encoded with H.265 (HEVC).
+</p>
+<p>
+    Use your imagination <i class="fas fa-smile-wink"></i>
+</p>