Vlaar believes the negatives should not be allowed to outweigh the positives from the performances in the second half against Newcastle - where they were beaten 2-1 - and for long spells at Goodison Park.
He said: "You think about that moment of course (when Everton equalised) but I think there also were a lot of good moments in the game, for me but also for the team.
"I think we have to hold onto the things that went well and we played very well as a team.
"The second half against Newcastle and the 90 minutes against Everton, that's something we can build on and that's the most important thing.
"We believe in each other, that's the most important thing for now and we definitely need a result now."