為更專門的工作 for more specialized work
為晉升的`前途 for prospects of promotion
為更高層次的工作責任 for higher responsibility
為擴大工作經驗 for wider experience
找一份更好的工作 to seek a better job
由於僱用期滿 due to expiry of employment
找到了更好的工作 sought a better job
由於公司倒閉 due to close-down of company