What if I want to search for a word? and see how it was used?It would probably help if you explain what exactly you are expecting, because TITUS is a good quality database: each line providing a copy of the original text in the original cuneiform script, followed by a transliteration, followed by a reconstructed pronunciation.
I did that but the words do not have an English translation?You can do that in TITUS. In the right bottom pane, you click on "Switch to Word Index". Then you can search for words in "transliteration" (language = Oldpersian-trl.) or "transcription" (language = Oldpersian-trs.). You can use * as wildcard after at least one initial letter. There is also a link on the search-page about how to replace the accented/special characters by the normal Latin ones.