Sure, here is a more detailed paraphrasing of the text:It was only the former Netherlands, Arsenal, and Manchester United striker's fourth match as a manager after being appointed.

He mentioned, 'You'll encounter a number of bumps in your career.

This was a very big bump.

We learned a few more lessons from this match than we normally would.

'Sven Mijnans opened the scoring for AZ after just four minutes, but Luuk Brouwers equalized for Heerenveen midway through the first half.

Former Tottenham striker Troy Parrott, 22, soon put the home side back in front with his first goal for AZ.

Things quickly turned sour for the visitors at the start of the second half as Republic of Ireland frontman Parrott added a further three goals in just eight minutes.

Van Persie then watched his side concede a further four goals in the final 20 minutes, giving AZ Alkmaar their record win in the Eredivisie, moving them up to second place in the table.

It was also the first time Heerenveen had conceded nine goals in the league, leaving them 12th in the table, with four points from Van Persie's first four games in charge.

'This is part of football.

I have not been traumatized by this and neither have my players,' said Van Persie.

'Even when things aren't going your way, with three goals in quick succession in the second half, it's important to keep doing the things you agreed on.

'