Add tier for search by book title only

src/NzbDrone.Core/Indexers/Newznab/NewznabRequestGenerator.cs

@@ -62,6 +62,10 @@ namespace NzbDrone.Core.Indexers.Newznab
                 AddBookPageableRequests(pageableRequests,
                     searchCriteria,
                     $"&author={NewsnabifyTitle(searchCriteria.AuthorQuery)}&title={NewsnabifyTitle(searchCriteria.BookQuery)}");
+
+                AddBookPageableRequests(pageableRequests,
+                    searchCriteria,
+                    $"&title={NewsnabifyTitle(searchCriteria.BookQuery)}");
             }
 
             if (SupportsSearch)
@@ -78,6 +82,8 @@ namespace NzbDrone.Core.Indexers.Newznab
                     "search",
                     $"&q={NewsnabifyTitle(searchCriteria.AuthorQuery)}+{NewsnabifyTitle(searchCriteria.BookQuery)}"));
 
+                pageableRequests.AddTier();
+
                 pageableRequests.Add(GetPagedRequests(MaxPages,
                     Settings.Categories,
                     "search",