diff --git a/Marco.Pms.Services/Service/PurchaseInvoiceService.cs b/Marco.Pms.Services/Service/PurchaseInvoiceService.cs
index 34b618c..6e138b0 100644
--- a/Marco.Pms.Services/Service/PurchaseInvoiceService.cs
+++ b/Marco.Pms.Services/Service/PurchaseInvoiceService.cs
@@ -232,6 +232,11 @@ namespace Marco.Pms.Services.Service
                     query = query.Where(pid => projectIds.Contains(pid.ProjectId));
                 }
 
+                if (!string.IsNullOrWhiteSpace(searchString))
+                {
+                    query = query.Where(pid => pid.Title.Contains(searchString) ||
+                    (pid.UIDPrefix + "/" + pid.UIDPostfix.ToString().PadLeft(5, '0')).Contains(searchString));
+                }
                 // Compute total count before paging
                 var totalCount = await query.CountAsync(ct);