diff --git a/local/config/vufind/searchspecs.yaml b/local/config/vufind/searchspecs.yaml
index 9a816e4304db6393be2a2b424ac011580e77b5c3..6c329cc6a2bd5c749a521dcaaead87126c791fee 100644
--- a/local/config/vufind/searchspecs.yaml
+++ b/local/config/vufind/searchspecs.yaml
@@ -237,15 +237,23 @@ Author:
 ISN:
   DismaxFields:
     - isbn
+    - isbn_isn_mv
     - issn
+    - issn_isn_mv
     - ismn
   QueryFields:
     issn:
       - [and, 100]
       - [or, ~]
+    issn_isn_mv:
+      - [ and, 50 ]
+      - [ or, ~ ]
     isbn:
       - [and, 100]
       - [or, ~]
+    isbn_isn_mv:
+      - [and, 50]
+      - [or, ~]
     ismn:
       - [and, 100]
       - [or, ~]
@@ -490,7 +498,9 @@ AllFields:
     - allfields
     - fulltext
     - isbn
+    - isbn_isn_mv
     - issn
+    - issn_isn_mv
     - ismn
 
   QueryFields:
@@ -582,8 +592,12 @@ AllFields:
       - [or, 250]
     isbn:
       - [onephrase, 500]
+    isbn_isn_mv:
+      - [onephrase, 250]
     issn:
       - [onephrase, 500]
+    issn_isn_mv:
+      - [ onephrase, 250 ]
     ismn:
       - [onephrase, 500]
     imprint: