To search the text in a table column, focus this column (by selecting any cell in it), enter your text in Search window and press ENTER or click the Find button 
(or choose first item from the drop-down menu near the button). This will find the first occurrence of the text. If you want to find the next occurrence, choose Search Again from the drop-down menu near the Find button or press F3. You can turn on/off case sensitivity of the search by choosing Case Sensitive from the drop-down menu near the Find button.
For numeric fields, only text that matches all field text can be found. For text fields, the search can done by partial matching.
The last 25 search texts are stored and available for reusing.