diff --git a/shimatta_kenkyusho/parts/views/component_views.py b/shimatta_kenkyusho/parts/views/component_views.py
index de80bce..33ccd0f 100644
--- a/shimatta_kenkyusho/parts/views/component_views.py
+++ b/shimatta_kenkyusho/parts/views/component_views.py
@@ -29,7 +29,7 @@ class ComponentView(LoginRequiredMixin, BaseTemplateMixin, TemplateView):
         error_string = ''
 
         if not search_string:
-            return queryset
+            return queryset, error_string
         
         search_parser = ShimattaSearchLanguage()
         query, errors = search_parser.search_for_components(search_string)
diff --git a/shimatta_kenkyusho/shimatta_modules/ShimattaSearchLanguage.py b/shimatta_kenkyusho/shimatta_modules/ShimattaSearchLanguage.py
index d21c8b1..f88d7a1 100644
--- a/shimatta_kenkyusho/shimatta_modules/ShimattaSearchLanguage.py
+++ b/shimatta_kenkyusho/shimatta_modules/ShimattaSearchLanguage.py
@@ -13,7 +13,7 @@ class ShimattaSearchConstants():
     PREFIX_DICT.update({k: v for k, v in EngineeringNumberConverter.it_prefixes if k})
     PREFIX_RULE = r'(' + r'|'.join([rf'(?:{p})' for p in PREFIX_DICT.keys()]) + r')?'
 
-    TEXTUAL_REGEX = r'(?:([^"\s]+))|(?:"([^"]*)")'
+    TEXTUAL_REGEX = r'(?:([^"><=!&\|\(\)\s]+))|(?:"([^"]*)")'
     VALUE_REGEX = rf'(\-?\d+(?:\.\d+)?){PREFIX_RULE}'
 
     TEXTUAL_PATTERN = re.compile(TEXTUAL_REGEX)
@@ -30,14 +30,14 @@ class ShimattaSearchLexer(Lexer):
     ignore = ' \t\n'
 
     # Regular expression rules for simple tokens
-    GT        = r'>'
-    LT        = r'<'
     GTE       = r'>='
     LTE       = r'<='
+    GT        = r'>'
+    LT        = r'<'
     EQ        = r'=='
     NEQ       = r'!='
-    AND       = r'&'
-    OR        = r'\|'
+    AND       = r'(?:&{1,2})|(?:and)|(?:AND)'
+    OR        = r'(?:\|{1,2})|(?:or)|(?:OR)'
     LPAREN    = r'\('
     RPAREN    = r'\)'