Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets"
"van dang code snippets" » "van dang cong snippets", "van dang co snippets", "van dang de snippets", "van dong code snippets", "van dung code snippets", "van nang code 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 java snippets") or ("van dang code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java java snippets") OR ("van dang code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java java snippets ) or ( van dang code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java java snippets") or ("van dang code snippets"))) or ("locating bug core snippets"))*.