Note: Significant advances in Google's ability to handle foreign languages and PDFs have convinced us to use this robust search engine. Here are some basic tips:
1) Use text in any language. You do not need to use accents for Greek.
2) Put quotation marks around a particular combination of words (e.g., “walling off”) if you want Google to find that precise phrase.
3) Consult Google's Basic Search Help and Filtering Tips, or use its Advance Search Page, to refine and augment your searching capabilities.