Perhaps you should try some spelling variations:
data relating » data creating, data reading, data reporting
relating air » relating a, relative air, regulating ai
dong hoang » hong hong
hua when » hua chen, hua ren, sea when
air raid » air raids, air land
dong di » dong sin
a when » 3 when, 4 when, 1 when

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: ((dong di) OR (dong hoang)) ya ((((hua when) OR (a when))) OR (hua wei)) data relating air raid ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong di) or (dong hoang)) ya ((((hua when) OR (a when))) or (hua wei)) data relating air raid ;~".
• Adding a wildcard symbol may retrieve word variants: ((dong di) or (dong hoang)) ya ((((hua when) OR (a when))) or (hua wei)) data relating air raid ;*.