Final Fantasy Tactics Advance?

I need help! There are 7 missions that I have not been able to complete, and I need help on how to either make these missions show up or how to get the items.... there is... #142-Ghosts of War(I need the Tranquil Box), #160-A Worthy Eye(feather badge&delta fang), #163-Stage Fright(need Old Statue), #268-Food For Truth(need Choco Gratin), #273-Who am I?(need two Magic Medals), #292-A stormy night(need rusty spear and mysidia alloy), and #297-Armor&Turtle(need adaman alloy and rat tail).... I know, that's a lot, but if anyone can help, I would really appreciate it....