fix-issue-20689

Author: Nazar65

app/code/Magento/Search/Model/ResourceModel/SynonymReader.php

@@ -85,7 +85,6 @@ protected function _construct()
      */
     private function queryByPhrase($phrase)
     {
-        $phrase = rtrim($phrase, "-");
         $matchQuery = $this->fullTextSelect->getMatchQuery(
             ['synonyms' => 'synonyms'],
             $phrase,

app/code/Magento/Search/Model/SynonymAnalyzer.php

@@ -54,8 +54,6 @@ public function getSynonymsForPhrase($phrase)
             return $result;
         }
 
-        $phrase = rtrim($phrase, "-");
-
         $synonymGroups = $this->getSynonymGroupsByPhrase($phrase);
 
         // Replace multiple spaces in a row with the only one space

lib/internal/Magento/Framework/Search/Adapter/Mysql/Query/Builder/Match.php

@@ -26,7 +26,7 @@ class Match implements QueryInterface
     /**
      * @var string
      */
-    const SPECIAL_CHARACTERS = '+~/\\<>\'":*$#@()!,.?`=%&^';
+    const SPECIAL_CHARACTERS = '-+~/\\<>\'":*$#@()!,.?`=%&^';
 
     const MINIMAL_CHARACTER_LENGTH = 3;