The benchmark search engine.

Sample searches:

第一四半期 English [to find English equivalents of 第一四半期]

咽癌 cancer [to find the English equivalent of 咽癌 when you think the word cancer might be included or nearby]

復刊とは [to search for a page defining the term 復刊]

N.B. If you don't include kana, Google might search only for Chinese sites. Add a は, add Japanese in the language preferences, or use the Japanese Google site to avoid this.

Also see the conversion tools category for more Google tips.