Primary care doctors have reported problems making referrals for patients who have purchased some of the cheaper plans from the federal insurance marketplace.Complaints about narrow networks with too few doctors have attracted the attention of federal regulators and have even prompted lawsuits. But they're also causing headaches in the day-to-day work of doctors and clinics. "The biggest problem we've run into is figuring out what specialists take a lot of these plans," said Dr. Charu Sawhney of Houston. Sawhney is an internist at the Hope Clinic, a federally qualified health center in southwest Houston, in the bustling heart of the Asian immigrant community. Her patients speak 14 different languages, and many of them are immigrants or refugees from places as far flung as Burma and Bhutan.