Perhaps you should try some spelling variations:
1990 under » 1990 und, 10 under, 1990 der
under one » under age
one small » some small
lang yan » wang yan, wang yang, zhang yan
can 1990 » von 1990, ab 1990, a 1990
one task » dce task
yan can » yan clan, man can, yan cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: lang yan can 1990 under one task ((one saul) or (one small)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang yan can 1990 under one task ((one saul) OR (one small)) ;.
• Adding a wildcard symbol may retrieve word variants: lang yan can 1990 under one task ((one saul) or (one small)) ;*.