They don't know what job I had, because most of the old people that are not open to new ideas, sometimes causes problems in getting cooperation from the other parties.
They do not know what my job. Because most people are old people who rarely open to new ideas. Sometimes there was a problem with the cooperation of other parties.
They don't know how I work? Because most people are not exposed to an old and new ideas Sometimes cause problems in the cooperation of the other party with .