Masaharu Fukuyama Song Help

[PsycoFrame]

Hello. I'm looking for a Masaharu Fukuyama song but I don't know the title. I'm not very familiar with this guy but my co-worker (heard the song at work) said it's him but she also doesn't know the title.

The chorus goes something like this..

WOAHH OHHH wakalan nai ("I don't know"?)
WOAHH OHHH (something)
wOAHH OH OH OH

Yea... sorry. I don't know Japanese and this is all I can make out of it =/
It's not "Woh wow". I browsed through every one of his video on youtube but I can't find it so I thought I might get an answer here.

So any masaharu fan out there.. please help! Just want to know the title. much appreciation to you.

[oopysirc]

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[ZhangKhaiEn]

His song "Good Luck" has a lot of "woahh ohhh" in it. It's been a while since I've heard it, but that might be the answer to your question.