Treeung or Treeing: How To spell?

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

Word contains consecutive vowels 'EI' in between alphabets tre & ng is misspelled as 'EU'
Wrong Spelling:  tre-eu-ng 
Correct Spelling:  tre-ei-ng 
Check more misspelled words of Treeing to spell it correct.