Sorry, no online dictionaries contain the exact phrase principle of effectiveness.
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Reverse dictionary results:
1. life
 2. value
3. a posteriori
4. a priori
5. absolutism
6. anarchy
7. animism
8. application
9. aroma
10. autocracy
 11. avatar
12. base
13. causation
14. cause
15. causing
16. caveat emptor
17. central
18. centralism
19. conscience
20. constant
 21. credit
22. criterion
23. cui bono
24. decorum
25. deduce
26. deduction
27. drive
28. dynamic
29. elective
30. electromagnet
 31. equality
32. essence
33. essential
34. establish
35. evil
36. evilness
37. faith
38. federalism
39. fundamental
40. generality

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