Perhaps you should try some spelling variations:
"danh phuc ca snippets" » "hanh phuc ca snippets", "danh thuc ca snippets", "dinh phuc ca snippets", "danh phuc cam snippets", "danh phuc cua snippets", "danh phuc cac 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: (((("danh phuc ca snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("danh phuc ca snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh phuc ca snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh phuc ca snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.