Searches of PubMed and CINAHL for your concepts of nurses aides, communication, and education found the following articles.
Fukaya, Yasuko, et al. “Education to promote verbal communication by caregivers in geriatric care facilities.” Japan journal of nursing science 6.2 (2009):91-103.
McGilton, Katherine S, et al. “A systematic review of the effectiveness of communication interventions for health care providers caring for patients in residential care settings.” Worldviews on evidence-based nursing 6.3 (2009):149-159.
Levy Storms, Lené. “Therapeutic communication training in long-term care institutions: recommendations for future research.” Patient education and counseling 73.1 (2008):8-21.
Williams, Kristine N, Teresa BIlten, and HelenBower. “Meeting communication needs: topics of talk in the nursing home.” Journal of psychosocial nursing and mental health services 43.7 (2005):38-45.
Cunningham, Adrian. “Developing a communications course for health care assistants.” Nursing times 100.47 (2004):36-38.
Williams, Kristine Enhancing communication with older adults: overcoming elderspeak. Journal of Gerontological Nursing 2004 vol:30 iss:10 pg:17 -25
Stevens Roseman, Ellen S, and PatrickLeung. “Enhancing attitudes, knowledge and skills of paraprofessional service providers in elder care settings.” Gerontology & geriatrics education 25.1 (2004):73-88.
Counsell, Colleen M, and RoseRivers. “Inspiring support staff employees.” The Journal of nursing administration 32.3 (2002):120-121.
Burgio, L D, et al. “Come talk with me: improving communication between nursing assistants and nursing home residents during care routines.” Gerontologist, The 41.4 (2001):449-460.
McCallion, P, et al. “Educating nursing assistants to communicate more effectively with nursing home residents with dementia.” Gerontologist, The 39.5 (1999):546-558.
Thomas, L H. “A comparison of the verbal interactions of qualified nurses and nursing auxiliaries in primary, team and functional nursing wards.” International journal of nursing studies 31.3 (1994):231-244.