Can you suggest how I might contact him?

我怎么才能联系上他，你能出个主意吗？

《牛津词典》

I tried to contact him but was unable to.

我试着跟他联系，却没联系上。

《牛津词典》

How are you going to 1 contact him?

你要怎么联络上他？

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His travels took him into contact with observatories, museums, hospitals, botanical gardens.

他到处游历,接触到了天文台,博物馆,医院,植物园

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and there is no way of getting in contact with him

我已经没法跟他联系上了。

I can't help but 实战 - SpeakingMax英语口语达人

The BBC has tried to contact him for his response to the trust's comments.

BBC: Merthyr v Cardiff to raise cash

Attempts to contact him have been unsuccessful and no-one from the company was available to comment.

BBC: Sark Estate Management 'shedding more than 100 jobs'

Like some other potential candidates, Rush suggested the onus would be on the FAW to contact him.

BBC: Ian Rush says he is capable of doing Wales job