Perhaps you should try some spelling variations:
"dong vuon toi snippets" » "dong von toi snippets", "dong cuon toi snippets", "duong vuong toi snippets", "dong vuong thi snippets", "dong huong toi snippets", "dong vuot troi 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 vuon toi 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 vuon toi snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong vuon toi snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong vuon toi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.