You can use the Search Oracc box at the top right of the Oracc home page, and on several project home pages, to search intuitively across the whole of the Oracc site or across that project. This page gives some hints on how to do that most effectively.
The Full Text Search on the Oracc home page is designed to be used very intuitively. Just enter one or more words in any relevant modern or ancient language (in transliteration or transcription) and see what happens. Results will be returned from text transliterations, translations, language glossaries, and portal pages across Oracc - wherever your word occurs.
Compared to Oracc's corpus, glossary and advanced search functions, the Full Text Search is quite fuzzy. It just searches for strings of characters, regardless of whether they are a whole word, or which language they are in. So although the Full Text Search is useful for locate which projects or corpora words appear in, it does not replace the much more sophisticated corpus, glossary and advanced search functions.
lugal, or even
LuGAlas you like;
manwill find both the English word and the cuneifom transliteration (whether syllable or logogram);
manwill not find (English)
menas the corpus search does;
gubwill also find
akaluwill find both
šthough, so we recommend having a Unicode keyboard installed on your computer;
Eleanor Robson, 'Full Text Search in Oracc', Oracc: The Open Richly Annotated Cuneiform Corpus, Oracc, 2014 [http://oracc.museum.upenn.edu/doc/search/fulltextsearch/]