The long EW sound, /u/, is spelled many ways:
OO: goose
EU: pseudonym
EW: flew
O: do
OE: shoe
OU: Lou
U: Ruth
OUGH: through
WO: two
UI: fruit
How to spell the long EW sound
May 14, 2014 | How to pronounce English words correctly, Pronunciation Training, Spelling rules and pronunciation