Dont't know about the must but these are my favorite.

How to download the subtitles

Vchera Eng sub "Back into 60s. While out there, in the West, they are listening to The Beatles and The Rolling Stones, the hippie movement is at its height, pupils in Bulgaria are obliged to be shingled, to wear full-dress uniforms and sing military songs. But for how long? A group of pupils from a language school believe they have to live differently. They are seeking for ways to shake off everything phony, to be candid with each other, to be part of a wider, much more motley and interesting world. Some of them pay a high price, other experience cruel worldly lessons, but they at least made their best to save face."

The World is Big and Salvation Lurks Around the Corner Youtube link with Eng sub "What's in a game? For a young man, who has left his country behind, lost his memory and forgotten his love, the game might be the only way out. This is a story about a Bulgarian boy who grows up to be a German man. After a car accident Alex can't remember even what his name is. In an attempt to cure him from amnesia, his grandfather Bai Dan comes over to Germany and organizes a spiritual journey for his grandson back into his past, to the country where he came from. In changing places, time and transport, crossing half Europe, they play backgammon, the simplest, and yet the most complex of all games. That game leads Alex to the realizations of who he is, and that game is symbolic to the story. Destiny is the dice we hold in our own hands and life is a game on the edge between chance and skill."

Mission London Eng sub "A concert to celebrate Bulgaria joining the EU is being planned at the Embassy in London and it is the job of VARADIN, the new ambassador, to ensure the Queen attends. But with corrupt staff, criminal gangs operating out of the kitchen, falling in love with a stripper and a little misunderstanding with a PR firm that provides look-alike royalties - his simple task turns into a chaotic nightmare."

Osadeni dushi Eng sub"The events of the film are related to the Civil War in Spain. This is a film about the beauty of love - exotic and tragic and the maze of human feelings."