Treeeng or Treeing: How To spell?

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

Word contains consecutive vowels 'EI' in between alphabets tre & ng is misspelled as 'EE'
Wrong Spelling:  tre-ee-ng 
Correct Spelling:  tre-ei-ng 
Explore spell check of Treeing to spell without errors.