CREATE TABLE table_14903491_1 (womens_singles VARCHAR, womens_doubles VARCHAR)

Name the womens singles for raina tzvetkova petya nedelcheva
SELECT womens_singles FROM table_14903491_1 WHERE womens_doubles = "Raina Tzvetkova Petya Nedelcheva"
SELECT "womens_singles" FROM "table_14903491_1" WHERE "Raina Tzvetkova Petya Nedelcheva" = "womens_doubles"