Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ninh viet do snippets" » "sinh vien do snippets", "anh viet do snippets", "ninh viet dao snippets", "ninh viet doi snippets", "ninh viet o 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 do 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 do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ninh viet do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ninh viet do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.