Some search terms to try when searching databases for this topic:
Anxiety
College student attitudes
Freedom of speech
Hate speech
Mental health of students
Microaggressions
Post traumatic stress disorder
Psychology of college students
Safe spaces in education
Secondary traumatic stress
Trauma trigger
Trigger warning
Anxiety: Heightened fear or tension that causes psychological and physical distress; the fifth edition of the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (DSM-5) recognizes several types of anxiety disorders, which can be successfully treated through counseling or with medications.
Freedom of speech: The right to express oneself, either orally or in writing, without fear of governmental restraint or retribution. In the U.S., this freedom is protected by the 1st Amendment to the Constitution, and is considered essential to the vitality of representative government.
Hate speech: speech that impugns an individual or group based on race, ethnicity, religion, gender, or sexual orientation.
Post traumatic stress disorder: A trauma- and stress-related disorder resulting from direct or indirect exposure to actual or threatened death, serious injury, or sexual or emotional violence and characterized by persistent difficulties that negatively affect an individual's social interactions, capacity to work, or other areas of functioning.
Trauma trigger: An occurrence that reminds someone of a painful and traumatic experience. The memory of the trauma, called a flashback or a memory tape, will replay in the person's mind.
Trigger warning: a statement at the start of a piece of writing, video, etc., alerting the reader or viewer to the fact that it contains potentially distressing material (often used to introduce a description of such content).