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