Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc tang cua snippets" » "do tang cua snippets", "duc tang cua snippets", "soc trang cua snippets", "doc mang cua snippets", "doc hang cua snippets", "doc tang luan 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: (((("doc tang cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doc tang cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc tang cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc tang cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.