B747 REQUIRED TO TAKE EVASIVE ACTION TO AVOID 2 FOREIGN CARRIERS WHILE DEPARTING IN ZSSS CTL.

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WE DEPARTED ZSSS ARPT ON RWY 36 WITH CLRNC TO MAINTAIN RWY HDG AND 900 METERS (2960 FT QFE). WE WERE THEN CLRED TO TURN L TO HDG 160 DEGS AND CLB TO 1200 METERS (3940 FT QFE) FOLLOWED BY CLRNC TO TURN L DIRECT TO 'WB' BEACON AND CLB TO 1500 METERS (2930 FT QFE). WE WERE THEN INSTRUCTED TO TURN R TO HDG 180 DEGS. SHORTLY AFTER TURNING TO 180 DEGS AND LEVEL AT 1500 METERS; WE RECEIVED A TCASII TA AND A VISUAL DISPLAY OF TFC CLOSE IN AT ABOUT 8:30 - 9 O'CLOCK POS; 700 FT. THE SO AND I ACQUIRED VISUAL CONTACT WITH A B757. THE TFC APPEARED TO BE CONVERGING; SLIGHTLY LOW; AND TURNING TO A COLLISION COURSE WITH US. WE TURNED TO A 195 DEG HDG AND I TOLD ZSSS DEP CTL WE TURNED TO HDG 195 DEGS TO AVOID TFC. CTL THEN TOLD ME TO MAINTAIN HDG 195 DEGS AND 1500 METERS. I WATCHED AS THE B757 PASSED CLOSE BEHIND (WITHIN 1/4 MI) AND SLIGHTLY BELOW. CLOSE ENOUGH IN MY MIND TO BE A NEAR MISS. ALMOST IMMEDIATELY THEREAFTER; A SECOND LARGE ACFT; AN AIRBUS (?) PASSED DIRECTLY THROUGH OUR ALT IN A STEEP DIVE AND HIGH SPD. THE AIRBUS APPEARED ONLY MOMENTARILY ON TCASII AT +1100 FT AND WE DIDN'T RECEIVE AN AURAL WARNING. WE ESTIMATE THAT WAS IN A 20 DEG NOSE DOWN ATTITUDE AND PASSED WITHIN 1/2 MI. WE WERE THEN GIVEN CLRNC TO TURN L DIRECT TO NHW VOR AND THE REST OF THE FLT WAS UNEVENTFUL. CONTRIBUTING FACTORS IN THIS CHAOTIC SIT WERE CERTAINLY REDUCED VISIBILITY (IMC -- 1 MI OR LESS) AND POOR COMS. ALL COMS WITH THE OTHER ACFT WERE IN CHINESE AND THEREFORE MEANINGLESS TO US. THE FREQ WAS VERY CONGESTED; HOWEVER; WHAT LITTLE ENGLISH WAS SPOKEN WAS EASILY UNDERSTOOD AND THE RADIO XMISSION QUALITY WAS ACCEPTABLE.