Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phap viet dt snippets" » "phap viet dat snippets", "phap viet da snippets", "phap viet du snippets", "phan viet dt snippets", "pham viet dt 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: (((("phap viet dt snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phap viet dt snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phap viet dt snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phap viet dt snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.