Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van ngu can snippets" » "han ngu can snippets", "van nga can snippets", "van ngo can snippets", "van ngu ca snippets", "van ngu van snippets", "van ngu dan 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: (((("van ngu can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van ngu can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van ngu can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van ngu can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.