They might. Subterranean termites, of most types, will travel at least 50 metres through the soil from their nest to exploit good food. Termites flying from colonies can sometimes spread a thousand metres. If your house is well maintained and has a termite management plan, the risk can be reduced to something quite acceptable (but the risk is never totally removed). Apart from known colonies of major pests very close to a building, there is usually little to be gained from trying to wipe out all the possible colonies in your area. This is especially true if the termites are local native species and you live in a wooded area. Relax, follow your management plan and be sure to have regular inspections so that if they do get through, nothing much has time to happen. Do keep in mind that not all types of termites are pests and the ones you find outside my not be at all interested in your house.