Perhaps you should try some spelling variations:
research assistance » search assistant
research assessment » resource assessment, resources assessment
research assistant » search assistant
research assessing » research session

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((research assistance) OR (((((research assistant) OR (research assessing))) OR (research assessment)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((research assistance) or (((((research assistant) OR (research assessing))) or (research assessment))))".
• Adding a wildcard symbol may retrieve word variants: ((research assistance) or (((((research assistant) OR (research assessing))) or (research assessment))))*.