diff --git a/IRaCIS.Core.Application/Service/Institution/SiteService.cs b/IRaCIS.Core.Application/Service/Institution/SiteService.cs
index 33ccf3180..72e901cc3 100644
--- a/IRaCIS.Core.Application/Service/Institution/SiteService.cs
+++ b/IRaCIS.Core.Application/Service/Institution/SiteService.cs
@@ -54,8 +54,8 @@ namespace IRaCIS.Application.Services
         public async Task<PageOutput<TrialSiteAddView>> GetTrialSiteList(TrialSiteInQuery inQuery)
         {
             var query = _repository.Where<TrialSite>(t => t.SiteId == null)
-                .WhereIf(string.IsNullOrEmpty(inQuery.TrialSiteName), t => t.TrialSiteName.Contains(inQuery.TrialSiteName) || t.TrialSiteAliasName.Contains(inQuery.TrialSiteName))
-                .WhereIf(string.IsNullOrEmpty(inQuery.TrialCode), t => t.Trial.TrialCode.Contains(inQuery.TrialCode))
+                .WhereIf(!string.IsNullOrEmpty(inQuery.TrialSiteName), t => t.TrialSiteName.Contains(inQuery.TrialSiteName) || t.TrialSiteAliasName.Contains(inQuery.TrialSiteName))
+                .WhereIf(!string.IsNullOrEmpty(inQuery.TrialCode), t => t.Trial.TrialCode.Contains(inQuery.TrialCode))
                 .Select(t => new TrialSiteAddView()
                 {
                     TrialCode = t.Trial.TrialCode,