Perhaps you should try some spelling variations:
"dong mau chap snippets" » "dong mau code snippets", "dong ma chap snippets", "dang mau chap snippets", "dong ha chap snippets", "dong cau chap snippets", "dong mau chan snippets", "dong mau cau 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: (((("dong mau chap snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong mau chap snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong mau chap snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong mau chap snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.