Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"quan van ong snippets" » "luan van ong snippets", "quan va ong snippets", "quan luan ong snippets", "quan van dong snippets", "quan van cong snippets", "quan van long 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: (((("quan van ong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("quan van ong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quan van ong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quan van ong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.