Perhaps you should try some spelling variations:
"dung nam chan snippets" » "dung nam code snippets", "dong nam chan snippets", "dung lam chan snippets", "sung nam chan snippets", "dung cam chan snippets", "dung nam cham snippets", "dung nam phan 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 nam chan 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 nam chan snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung nam chan snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nam chan snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.