Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van nang cn snippets" » "van quang cn snippets", "van ban cn snippets", "van dong cn snippets", "van nang can snippets", "van nang co snippets", "van dang cn 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 nang cn 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 nang cn snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van nang cn snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van nang cn snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.