Awasu's advanced search engine lets you find the information you are looking for.
Open the Find dialog from the menu. Then type in what you are looking for, where you want to search and over what period of time.
You can control how feed item content will be presented in the results page:
To do a simple search, make sure the Enable advanced syntax checkbox is un-ticked.
Type in one or more words you want to look for and Awasu will locate feed items that contain any of these words (i.e. it will do a boolean OR search).
For more advanced search queries, first make sure Enable advanced syntax is ticked.
You can search for words or phrases (enclosed in double quotes), optionally joined together using the boolean keywords OR, AND, NOT (which must be in capitals). If no boolean operator is specified, OR is assumed.
Words and phrases may also be preceded by a plus/minus sign to indicate that they must or must not appear in documents.
Words and phrases can also be grouped by enclosing them in parentheses.
You can use ? to represent a single character or * for 0 or more characters.
Words or phrases can be marked as being more important by appending a ^ followed by the boost factor. This is a number that indicates how important the word or phrase is to the query. By default, each word or phrase is given a boost factor of 1 but you can change this for each one. Values must be greater than 0 but can be less than 1 (to indicate less important terms). For example: "hello world"^2 foobar^0.5.
Proximity searches can find words that are near each other. Append a ~ to the end of a phrase followed by the range in words. For example, "foo bar"~10 finds documents that contain the words "foo" and "bar" within 10 words of each other.
You can also do fuzzy searches by appending a ~ to the end of a single word (not phrase). For example, "roam~" will match words like "foam" and "roams".