Sorry, no online dictionaries contain the exact phrase what you need to know.
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Reverse dictionary results:
1. information
2. knowledge
3. facts
4. details
5. intelligence
6. know
7. knowlege
8. au fait
9. can
10. exoterica
11. knaw
12. kno
13. know-how
14. know what's what
15. knowhow
16. known
17. knows
18. true name
19. understanding
20. bead
21. cognoscente
22. common knowledge
23. cun
24. fact
25. familiarity
26. knaa
27. know of
28. knowingly
29. knowledg
30. knowledgable
31. knowne
32. skill
33. well known
34. authentic
35. beknown
36. capital
37. deed
38. factfile

You can look up the words in the phrase individually using these links:   what ?   you ?   need ?   to ?   know ?
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what*to search for words beginning with what, or
*knowto search for words ending with know
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