Perhaps you should try some spelling variations:
"duong tuan cu snippets" » "duong quan cu snippets", "duong xuan cu snippets", "duong tan cu snippets", "duong tuan tu snippets", "duong quan cua snippets", "duong tuan thu 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 tuan cu 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 tuan cu snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong tuan cu snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong tuan cu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.