Thanks so much for your help on this. By the way, when I was stduying in the U.S, I was employed on part time contract with a small company in Vietnam so how does I suppose to prove this? According to this http://www.cic.gc.ca/english/pdf/kits/guides/E37057.pdf (for the Canada visa office in Singapore but I check other offices and they require the same) , I only need to submit
For you and your spouse or common-law partner:
• notarized employment contracts from your present and past employers,
accompanied by an English or French translation
• original and up-to-date letters of reference from your past and current employers.
Letters must be written on company letterhead and show the company’s full
address, telephone and fax numbers, and be stamped with the company’s official
seal.
Letters must include all of the following information:
• the specific period of your employment with the company
• the positions you have held during the period of employment and the time spent
in each position
• your main responsibilities in each position
• your total annual salary plus benefits
• the signature of your immediate supervisor or the personnel officer of the
company
• a business card of the person signing
Vietnam does not require income tax for people such as me during that time and the company made cash payment directly to me so I don't have any pay slips or tax document to prove it. The only thing I can have is the two documents that are on the list, and maybe the work contract . Do you think it's okay to submit this?