Perhaps you should try some spelling variations:
"dung cho chet snippets" » "dung cho code snippets", "dung chai chet snippets", "dung co che snippets", "dung cho chu snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung using java snippets" » "dung ung java snippets", "dung sinh java snippets", "dung uong java snippets", "dung using data 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 cho chet snippets") or ("dung using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cho chet snippets") OR ("dung using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung cho chet snippets ) or ( dung using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cho chet snippets") or ("dung using java snippets"))) or ("locating bug core snippets"))*.