Help

please i am a student in fourth year in the department of English,in our study we should make a thesis and our group choose to make a thesis in linguistics but we don't find a good and recent theme. in first time we chose (Adolescents with language disabilities)but the supervisor told us that this theme is general we should find a specific one but we are worried so i wanna your help sincerly to find a good theme because we are late and we do not have any idea concerning the thesis and the outline and thanks a lot