diff -r 084aae09edf4 -r 47f0611cc57d server/src/app/Http/Controllers/Api/ThemeController.php
--- a/server/src/app/Http/Controllers/Api/ThemeController.php	Thu Oct 06 11:14:32 2016 +0200
+++ b/server/src/app/Http/Controllers/Api/ThemeController.php	Thu Oct 06 16:45:37 2016 +0200
@@ -41,16 +41,22 @@
         $sort = $request->input('sort', 'count');
 
         if($filter === 'bnf') {
-            $include = ".*\|bnf\|.*";
+            $include = ".*\\|bnf\\|.*";
         }
         elseif($filter === 'lexvo') {
-            $include = ".*\|lxv\|.*";
+            $include = ".*\\|lxv\\|.*";
+        }
+        elseif($filter === 'olac') {
+            $include = ".*\\|olac\\|.*";
+        }
+        elseif($filter === 'txt') {
+            $include = ".*\\|txt\\|.*";
         }
         elseif($filter === 'all') {
             $include = false;
         }
         else {
-            abort(401,"Value for filter parameter must be in 'bnf', 'lexvo', 'all'");
+            abort(401,"Value for filter parameter must be in 'bnf', 'lexvo', 'olac', 'txt', 'all'");
         }
 
         if($sort == "count" || $sort == "descending") {
@@ -99,12 +105,20 @@
 
         $themes = [];
 
-        $bucketList = array_slice($esRes['aggregations']['subjects']['subjects']['buckets'], $index*$limit, $limit);
+        $bucketList = $esRes['aggregations']['subjects']['subjects']['buckets'];
+        if($limit > 0) {
+            $bucketList = array_slice($bucketList, $index*$limit, $limit);
+        }
 
         foreach($bucketList as $bucket) {
             $parts = explode("|", $bucket['key']);
             $label = $parts[0];
-            $url = ['bnf' => config('corpusparole.bnf_ark_base_url'), 'lxv' => config('corpusparole.lexvo_base_url')][$parts[1]].$parts[2];
+            if($parts[1] === 'bnf' || $parts[1] === 'lxv') {
+                $url = ['bnf' => config('corpusparole.bnf_ark_base_url'), 'lxv' => config('corpusparole.lexvo_base_url')][$parts[1]].$parts[2];
+            }
+            else {
+                $url = $parts[2];
+            }
             $themes[$url] = [
                 "label" => $label,
                 "count" => $bucket['doc_count']