Perhaps you should try some spelling variations:
"advanced testing in econometrics / advanced testing in econometrics" » "advanced routing in econometrics / advanced routing in econometrics", "advanced reporting in econometrics / advanced reporting in econometrics", "advanced training in econometrics / advanced training in econometrics"
"advanced editing in econometrics / advanced editing in econometrics" » "advanced editions in econometrics / advanced editions in econometrics"

Try widening your search to All Fields.

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: (((("advanced text in econometrics / advanced text in econometrics") OR ("advanced testing in econometrics / advanced testing in econometrics"))) OR ("advanced editing in econometrics / advanced editing in econometrics")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"advanced text in econometrics / advanced text in econometrics\") OR (\"advanced testing in econometrics / advanced testing in econometrics\"))) or (\"advanced editing in econometrics / advanced editing in econometrics\"))".
• Removing quotes may allow a broader search: (((( advanced text in econometrics / advanced text in econometrics ) OR ( advanced testing in econometrics / advanced testing in econometrics ))) or ( advanced editing in econometrics / advanced editing in econometrics )).
• Adding a wildcard symbol may retrieve word variants: (((("advanced text in econometrics / advanced text in econometrics") OR ("advanced testing in econometrics / advanced testing in econometrics"))) or ("advanced editing in econometrics / advanced editing in econometrics"))*.