Perhaps you should try some spelling variations:
"dung mau chan snippets" » "dung mau code snippets", "dung may chan snippets", "dung dau chan snippets", "dang mau chan snippets", "dung mau han snippets", "dung cau chan snippets", "dung mau 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 mau 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 mau chan snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung mau chan snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung mau chan snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.