FLC OF A 4 ENG WDB FAILED TO TURN TO THE SID DEP HEADING AFTER TKOF DUE TO NOT CLARIFYING THE DEP CLRNC WITH ATC AND THE FOREIGN LANGUAGE BARRIER.

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CLRNC DELIVERY XMISSION WAS LOUD BUT EXTREMELY GARBLED; SO MUCH SO THAT WE WERE UNABLE TO COPY CLRNC ON 4 INITIAL ATTEMPTS. ADD TO THAT THE LACK OF ANNUNCIATION THAT IS TYPICAL IN THE PACIFIC RIM AND YOU HAVE A POTENTIAL FOR DISASTER. I WAS STILL UNABLE TO COPY CLRNC BUT THE CAPT AND SO COPIED AND THE CAPT READ BACK THE CLRNC. CLRNC DELIVERY ACKNOWLEDGED AND DID NOT CORRECT THE READBACK. ON TAXI-OUT I NOTICED THE CAPT HAD A CERTAIN DEP PLATE ON HIS CLIP IN FRONT OF HIM. I INQUIRED ABOUT THE DEP TO THE CAPT; ASKED IF WE WERE CLRED FOR THAT PARTICULAR DEP. HE SAID NO; HE HAD IT OUT JUST IN CASE WE WERE CLRED FOR IT. (I FORGOT TO MENTION THAT IMMEDIATELY AFTER THE CAPT READ BACK THE CLRNC I TOLD THE CREW THAT I WAS UNABLE TO COPY OR UNDERSTAND ANY OF THE CLRNC.) WE WERE CLRED INTO POS ON RWY; THEN ISSUED CLRNC FOR TKOF. WHEN TWR WAS GIVING TKOF CLRNC INSTRUCTIONS THE CAPT WAS ADVANCING THE THRUST; AND THE SO STARTED READING FINAL TKOF CHKLIST. THEREFORE I ONLY COPIED THE DEP FREQ. THE CAPT WAS BUSY LISTENING TO THE SO. WHEN AIRBORNE I CONTACTED DEP CTL AND I ASSUMED WE WERE ON A RADAR VECTOR DEP. DEP CTL GAVE INSTRUCTIONS TO CLB TO 1600 FT; BUT I ASSUMED AND READ BACK HDG 160 DEGS. THE CAPT STARTED THE TURN AND THE CTLR SAID 'NEGATIVE CLB TO 1600 FT.' SO THE CAPT TURNED BACK TO RWY HEADING. AT THIS TIME WE WERE STILL ACCELERATING AND THE CAPT WAS CALLING FOR PROPER CLEAN-UP OF FLAPS WHEN THE CTLR SAID TO FOLLOW CLRED CLBOUT/DEP. THIS ADDED TO THE CONFUSION. I ASKED IF WE WERE TO USE SELKA 4A. AT THIS TIME THE CTLR SAID WE WERE CLRED 'NE 5A' AND ASKED OUR HEADING; THEN IMMEDIATELY TOLD US TO TURN TO 030 DEGS. WE WERE AT 11 DME FROM BKK WHEN STARTING TURN. OUR DUTY DAY STARTED AT XA20 WAKE-UP CALL. LEAVE HOTEL AT XB20 IN SINGAPORE. THERE WASN'T A PLACE TO EAT BREAKFAST AND THE COMPANY DIDN'T PROVIDE A CREW MEAL. OUR FLT WAS FINALLY CATERED IN BKK SHORTLY BEFORE OUR DEP. I AM CERTAIN THAT LOW BLOOD SUGAR WAS A FACTOR IN THE CREW'S PERFORMANCE.