Cambodia's Vietnam-installed government and delegates of the Khmer Rouge guerrillas clashed at peace talks that ended Thursday, and a settlement of the 9-year-old civil war remained elusive, participants said.

One participant, Foreign Minister Suppiah Dhanabalan of Singapore, said the four Cambodian factions remained "quite far apart" after four days of informal talks.The talks brought together Vietnam, the nominal coalition of three guerrilla groups opposing its occupation of Cambodia, the Phnom Penh government, and Vietnam's close ally, Laos.

Also attending were representatives of the Association of Southeast Asian Nations, which backs the guerrillas: Thailand, Singapore, Indonesia, Malaysia, the Philippines and Brunei.

Working groups of senior officials of all the parties are to be set up to discuss specific issues. By year's end, the groups are to make recommendations on holding another round of talks.

The guerrilla leaders were Khieu Samphan of the communist Khmer Rouge; Son Sann of the non-communist Khmer People's National Liberation Front; and Prince Norodom Ranariddh, representing his father, former Cambodian monarch Prince Nordom Sihanouk.

Vietnam maintains more than 100,000 troops in Cambodia to fight the guerrillas, but has pledged a total pullout by early 1990.