Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van so cong snippets" » "van bo cong snippets", "van cao cong snippets", "van hoc cong snippets", "van son cong snippets", "van soa cong snippets", "van su cong 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 so cong 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 so cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van so cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van so cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.