Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"toc chat cua snippets" » "toc cham cua snippets", "hoc chat cua snippets", "doc chat cua snippets", "toc nhat cua snippets", "toc chat va snippets", "toc chat huu 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: (((("toc chat cua snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toc chat cua snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toc chat cua snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toc chat cua snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.