Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"da duc dung snippets" » "da duc hung snippets", "da duc cuong snippets", "da duc phung snippets", "dao duc dung snippets", "da duoc dung snippets", "do duc dung snippets"
"locating bug core snippets" » "locating bug code snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java code snippets") or ("da duc dung snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("da duc dung snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( da duc dung snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("da duc dung snippets"))) or ("locating bug core snippets"))*.