Perhaps you should try some spelling variations:
"dung chu chan snippets" » "dung chu code snippets", "dung chau chan snippets", "dung cho chan snippets", "dung cu chan snippets", "dung chu han snippets", "dung chua chay snippets", "dung chu van 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 java java snippets") or ("dung chu chan snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("dung chu chan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dung chu chan snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dung chu chan snippets"))) or ("locating bug core snippets"))*.