1 seek（for) sth: 跟look for意思差不多，牛津上的解釋就是：to look for[第六版]，[I, Ipr esp passive 尤用於被動語態, Tn] ~ (after/for sth) look (for sth); try to find or obtain (sth) 尋找; 找到或得到（某事物）[第四版]
2 look (for sb/sth)： to try to find sb/sth 盡力尋找，尋找的東西可抽象（如solution），也可具體，見下：
I can't find my book-I've looked everywhere. ◆ Where have you been? We've been looking for you. ◆ Are you still looking for a job? ◆ We're looking for someone with experience for this post.）
3 前面兩個（seek for、look for）都是強調“尋找”這壹過程，find強調結果——“找到”
4 search，意指“搜尋、搜索”，牛津第四版的解釋為：搜查（某人）; 細查（某物或某處）以搜尋某人[某物]; 搜索，通常用search (for sb/ sth)的結構，同樣不知能否“找到”，只是強點要“尋”