Perhaps you should try some spelling variations:
"nhung hoc can snippets" » "chung hoc can snippets", "nhung goc can snippets", "khung hoc can snippets", "nhung hoc dan snippets", "nhung hoc cao snippets", "nhung hoc cac snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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

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