Perhaps you should try some spelling variations:
"statistics spring theory" » "statistical sampling theory" (Expand Search), "statistics string theory" (Expand Search), "statistics sharing theory" (Expand Search), "statistics using theory" (Expand Search)
"statistical china theory" » "statistical machine theory" (Expand Search), "statistical channel theory" (Expand Search), "statistical choice theory" (Expand Search), "statistical coding theory" (Expand Search)
"statistics pricing theory" » "statistics putting theory" (Expand Search), "statistics processing theory" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("statistics spring theory") OR ("statistics pricing theory"))) OR ("statistical china theory"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"statistics spring theory\") OR (\"statistics pricing theory\"))) OR (\"statistical china theory\"))".
• Removing quotes may allow a broader search: (((( statistics spring theory ) OR ( statistics pricing theory ))) OR ( statistical china theory )).
• Adding a wildcard symbol may retrieve word variants: (((("statistics spring theory") OR ("statistics pricing theory"))) OR ("statistical china theory"))*.