Retuning or Retaining: How To spell?

The word Retuning is misspelled against Retaining, which is present continuous of "Retain"

Word contains consecutive vowels 'AI' in between alphabets ret & ning is misspelled as 'U'
Wrong Spelling: ret-u-ning
Correct Spelling: ret-ai-ning
Check more misspelled words of Retaining to spell it correct.