Perhaps you should try some spelling variations:
"duong hoa hoi snippets" » "duong khoa hoi snippets", "dong hoa hoi snippets", "duong hoi hoi snippets", "duong hoa hoc snippets", "duong hoa doi 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: (((("duong hoa hoi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong hoa hoi snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong hoa hoi snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong hoa hoi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.