Treieng or Treeing: How To spell?

The word Treieng is misspelled against Treeing, which is present continuous of "Tree"

Word contains consecutive vowels 'EI' in between alphabets tre & ng is misspelled as 'IE'
Wrong Spelling:  tre-ie-ng 
Correct Spelling:  tre-ei-ng 
Find more wrongly spelled words of Treeing to spell it well.