Perhaps you should try some spelling variations:
"dang tuan hoan snippets" » "dang tran hoan snippets", "dang toan hoan snippets", "dang xuan hoan snippets", "dang tuan hoang snippets", "dang luan hoan snippets", "dang quan hoang 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: (((("dang tuan hoan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang tuan hoan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang tuan hoan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang tuan hoan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.