Chinese Vice Premier Teng Hsiao-ping, holding his first televised press conference in China, called on the United Nations to denounce Vietnamese aggression against Cambodia, but he failed to say if China would increase military aide to its beleaguered Indochinese ally.

"We have been giving the Cambodians all kinds of material assistance, but they don't need [military] advisers from us, because they have had their own rich experience," Teng told a group of visiting American journalists who questioned him in the Great Hall of the People.

The United Nations should "at least make clear its posiktion and give moral support" to Cambodia in its fight with Vietnamese backed insurgents, Teng said. "You cannot restrain the [Vietnamese] simply by some resolutions or other documents, but they have some effect anyway."

On the question of China's future relations with its estranged province, Taiwan, Teng appeared to take a harder line than he had in an interview with visiting U.S. congressmen Tuesday. He spoke then of China's intention "to use the hand of peace" in seeking Taiwan's return to mainland control, but today he refrained from making any specific promises on how Peking would deal with its Nationalist Chinese adversaries on Taiwan.

"President Carter indicated his wish that the Taiwan question could be settled through peaceful means," Teng said. "We have taken not of this wish. At the same time we have made clear that the solution of the question is China's internal affair."

When asked if China planned to buy weapons from the United States, Teng said, "We would, of course, like to absorb all modern things, but so far as we are aware the United States doesn't have any intention of selling us weapons."