請問這句英文表達對嗎？

I obtain more knowledge of office clerical work and interpersonal skills
from the job. 表達對嗎？

The meaning in your sentence is quite clear already in expressing your idea. To make it better, I have a few suggestions:
If you are referring to the job which you did or have been doing, use past tense or present perfect tense."acquire" goes with "knowledge" more often than "obtain" does.Use "in" the job for all the knowledge you acquired when you did the job."clerical work" already implies working in the office, so "office" can be omitted. "office duties" can also be used.A few ways to write the sentence:
I acquired more knowledge about clerical work and interpersonal skills in the job.I acquired more knowledge about office duties and interpersonal skills
in the job.I have acquired more knowledge about clerical work and interpersonal skills in the job.I have acquired more knowledge about office duties and interpersonal
skills in the job.

My interpersonal skills and work experience of clerk were acquired from the jobs.
My interpersonal skills and experience of office work were acquired from the jobs.
knowledge about something(wrong) , knowledge of something(correct)

2010-04-28 12:34:22 補充：
answer No.003 is the acceptable one, which is better than others' .

你指上一份工,令你學到文職同人際關係?
I have acquired(001啱嘅) much clerical knowledge and interpersonal skills from my last job.
上1份,用完成式
knowledge用得到acquire
office=clerical,
much=多
more=更多,但呢度唔係比較
the job唔夠清楚,具體,實在.

I gained much knowledge in office clerical work and interpersonal skills from the job.

knowledge 是uncountable.
用gain不是obtain.你想講「你取得」，但英語的講法是「你獲得」知識，用obtain一個學位degree或文憑diploma.
另外用in office...work，意思是在這類工作「裏」.

這些都是一般中英語法的差異問題，常出現在水平一般的學生寫作上，記住這些點子多加留意其他英語人寫求職信或職業雜誌的求職信示範會有更多收獲。

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祝您好運!