Perhaps you should try some spelling variations:
"dong minh cach snippets" » "duong minh cach snippets", "dong kinh cach snippets", "dong ninh cach snippets", "dong tinh cach snippets", "dong minh cac snippets", "dong minh chanh snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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 minh cach snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong minh cach snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong minh cach snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong minh cach snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.