[Scip] solving a nonconvex MIQP problem

[Wang Yihui]

I have a nonconvex MIQP problem to solve. 
I can solve the problem with 20 integer variables and 180 real variables using SCIP.
However, if I increase the size of the problem, then SCIP gave that: the maximum iteration is reached.
After I modified the value of the maximum iteration ten times more, SCIP still cannot obtain the results. 
Are there any other options that help me to solve this problem?

Thank you in advance!

Yihui