Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets"
"va dan toan snippets" » "va van toan snippets", "va dan than snippets", "va manh toan snippets", "ca dan toan snippets", "va dao toan snippets", "va dau toan snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

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