What was the surface of the match when the score was akgul amanmuradova chuang chia-jung?
CREATE TABLE "doubles_5_13" (
  "outcome" text,
  "date" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "surface" FROM "doubles_5_13" WHERE "score"='akgul amanmuradova chuang chia-jung';