Perhaps you should try some spelling variations:
spread timing » dream timing
china spread » china already, china sea, china korea
sites using » site using, states using, rates using
dong jung » hong jong, dong ping, dong yang
did china » did china's
fill soil » field soil, pile soil

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong sin) or (dong jung)) did china spread timing ((sites using) or (fill soil)) (thin or than) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong sin) OR (dong jung)) did china spread timing ((sites using) OR (fill soil)) (thin OR than) ;.
• Adding a wildcard symbol may retrieve word variants: ((dong sin) or (dong jung)) did china spread timing ((sites using) or (fill soil)) (thin or than) ;*.