Perhaps you should try some spelling variations:
teaching echandi » teaching change, teaching china, teaching anti
echandi roberto » chang roberto
time last » time list, time past, time class
time lost » time cost, time loss, time list
roberto n » robert _, robert e, robert j
yang yi » yang xi, yang jui

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: dan ((yang yi) OR (yang di)) ((time last) OR (time lost)) teaching echandi roberto n ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dan ((yang yi) OR (yang di)) ((time last) or (time lost)) teaching echandi roberto n ;~".
• Adding a wildcard symbol may retrieve word variants: dan ((yang yi) OR (yang di)) ((time last) or (time lost)) teaching echandi roberto n ;*.