Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets"
"vien trung hoc snippets" » "vien truong hoc snippets", "viet trung hoc snippets", "mien trung hoc snippets", "vien trung quoc 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: (((("using java java snippets") or ("vien trung hoc snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java java snippets") OR ("vien trung hoc snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java java snippets ) or ( vien trung hoc snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java java snippets") or ("vien trung hoc snippets"))) or ("locating bug code snippets"))*.