Sorry, no online dictionaries contain the exact phrase unknown cause.
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Reverse dictionary results:
1. mystery
2. enigma
3. conundrum
4. uncertainty
5. ambiguity
6. subtilty
7. abstruse
8. ambage
9. ambiguation
10. enigmatically
11. subtilely
12. subtilly
13. subtleness
14. subtlety
15. abstruseness
16. amphibological
17. amphibolous
18. cryptic
19. enigmatic
20. equivocation
21. equivocatory
22. grey area
23. intricacy
24. mysterious
25. obliquity
26. obscurantism
27. oracular
28. recondite
29. riddle
30. sphinx
31. subtil
32. subtile
33. abstrusely
34. allusiveness
35. arcane
36. circuitousness
37. complicacy

You can look up the words in the phrase individually using these links:   unknown ?   cause ?
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