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