A thermoplastic resin composition includes about 100 parts by weight of a base resin including (A) about 70 wt % to about 90 wt % of a polycarbonate resin, and (B) about 10 wt % to about 30 wt % of a polyethylene terephthalate resin, (C-1) about 1 to about 10 parts by weight of a first viscosity reinforcing agent having a core-shell structure including a rubbery polymer core and a shell formed by grating a monomer having compatibility with the polycarbonate resin (A), (C-2) about 1 to about 10 parts by weight of a second viscosity reinforcing agent having a core-shell structure including a rubbery polymer core and a shell formed by grafting a monomer having compatibility with the polyethylene terephthalate resin (B), and about 1 to about 10 parts by weight of an alkyl acrylate copolymer including a glycidyl methacrylate functional group.