WHITEHOUSE IS URGED TO AUTHORIZE ENTRY OF 15,000 INDQCHINESE
US State Dept asks Carter Adm to approve emergency admission of 15,000 Indochinese refugees stranded in Thailand and throughout SE Asia; White House reptdly is sympathetic to request; officials say Adm is aware of opposition from influential Cong members to any further entry of Indochinese without specific legis; US has admitted 145,000 refugees since fall of Saigon in '75; Repr Joshua Eilberg is major critic of proposal; State Dept officials say series of articles on refugees by NY Times writer Henry Kamm aroused concern in human rights and Asian burs of dept; State Sec Cyrus R Vance reptdly is taking personal interest in casing refugees' plight (M)