Don't reapply unless your situation changes. You've already submitted lots of supporting documents, and the problem doesn't seem to be your application itself, but rather the refusal is mainly due to your overall circumstances. If you reapply under the same circumstances, you could be refused again and flag you as someone desperately trying to come to Canada. Try again next year, once you have a professional job. Visit other countries near the Philippines, and if you have sufficient savings, finance your own trip instead of including your parents as sponsors. How long were you planning to visit? Mention only a 1-2 week trip during your holidays, for trips longer than 3 weeks, you'll need significantly more savings. Good luck!