To: OP
You live in an apartment?
Your apartment landlord is responsible for the common areas of the apartment (landings, stairwells, storage areas. basements etc) and should be aggressively treating those areas. Treating the common areas will isolate the roaches to a single apartment and over time will reduce or eliminate the bugs in that apartment.
Even if your apartment is dirty and attractive for roaches, we can pretty safely asume that your entire apartment complex is infected.
Your local goverment agencies (Health Dept, Housing Dept etc) can help with this issue.
BTW, bombing the apartment will do little good as the noxious fumes will just cause the little guys to move to another apartment temporarily and then return to your friendly confines at a later date.