搜索一个单词，就像我在codeigniter中的文本框中给出的不完全一样

I search a word from my DB using model in codeigniter. I done the search for exact word searching. but I need also find a word when I give partial word. I use LIKE clause for search a word. But I don't know how to use LIKE% clause in my model function.I search a word from my DB using model in codei