Confused about how to use a job title?

I worked a few years ago for an american company's representative office in Asia. Originally, they give me a title of Secretary because Foreign Entreprise's secretary was a big deal and a good job with good pay at the time. However,the actual job i did was a lot more than a secretary and organization structure/executives had changed many times. For a while, we had less than 10 people in the office: sales manager, technicans/engineer and me. Sales mananger kind of oversee everyone but not always. I was the contact of marketing, logistics,finance, executive assistant from the Headquarter. Bascially besides office management & administrative duties, I did all other 3 people's jobs in headquarters plus coordinate marketing activities. I had lots of interactions and communications with top executives and close relationship with a few managers. Before I left the company, someone even called me office manage; however I was not because I did not supervise other employees. Right now, I have a master's degree, relocated in the USA ,and am interested in a position as Market Research Analyst or other entry-level Program or Management Analyst. I feel it is unfair that I use Secretary in my resume; not to mention, the concept of Secretary in the USA is less honored than in the country I worked for. How about I used the title Administrative & Marketing Assistant? Please advice. Thanks.