diff --git a/apps/api/src/course/course.resolver.ts b/apps/api/src/course/course.resolver.ts
index e3f6f6b10..afb757949 100644
--- a/apps/api/src/course/course.resolver.ts
+++ b/apps/api/src/course/course.resolver.ts
@@ -9,7 +9,7 @@ import { isTime } from '@api/util/functions'
 
 import { Course, CourseDocument, DayOfWeek, GenEdType, Semester, StudyProgram } from '@cgr/schema'
 
-import { CourseGroupInput, FilterInput, Period } from '../graphql'
+import { CourseGroupInput, FilterInput, GradingType, Period } from '../graphql'
 import { CourseService } from './course.service'
 
 export interface ICourseSearchDocument {
@@ -29,6 +29,7 @@ export interface ICourseSearchDocument {
 export interface ICourseSearchFilter {
   keyword: string
   genEdTypes?: GenEdType[]
+  gradingTypes?: GradingType[]
   dayOfWeeks?: DayOfWeek[]
   periodRange: Period
   studyProgram: string
@@ -92,6 +93,7 @@ export class CourseResolver {
           keyword: filter.keyword,
           genEdTypes: filter.genEdTypes,
           dayOfWeeks: filter.dayOfWeeks,
+          gradingTypes: filter.gradingTypes,
           periodRange: filter.periodRange,
           studyProgram: courseGroup.studyProgram,
           semester: courseGroup.semester,
diff --git a/apps/api/src/search/queries/course.ts b/apps/api/src/search/queries/course.ts
index 6541de673..000b80b93 100644
--- a/apps/api/src/search/queries/course.ts
+++ b/apps/api/src/search/queries/course.ts
@@ -53,6 +53,57 @@ export function buildCourseQuery(filter: ICourseSearchFilter): Record<string, an
     })
   }
 
+  const containsSU = filter.gradingTypes?.includes('S_U')
+  const containsLetter = filter.gradingTypes?.includes('LETTER')
+
+  if (filter.gradingTypes && !(containsSU && containsLetter)) {
+    if (containsLetter) {
+      boolMust.push({
+        nested: {
+          path: 'rawData',
+          query: {
+            nested: {
+              path: 'rawData.creditHours',
+              query: {
+                bool: {
+                  must_not: [
+                    {
+                      wildcard: {
+                        'rawData.creditHours': '*S/U*',
+                      },
+                    },
+                  ],
+                },
+              },
+            },
+          },
+        },
+      })
+    } else if (containsSU) {
+      boolMust.push({
+        nested: {
+          path: 'rawData',
+          query: {
+            nested: {
+              path: 'rawData.creditHours',
+              query: {
+                bool: {
+                  must: [
+                    {
+                      wildcard: {
+                        'rawData.creditHours': '*S/U*',
+                      },
+                    },
+                  ],
+                },
+              },
+            },
+          },
+        },
+      })
+    }
+  }
+
   if (sectionsQuery.length > 0) {
     boolMust.push({
       nested: {