Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"data van cua snippets" » "data phan cua snippets", "dang van cua snippets", "dao van cua snippets", "data vang cua snippets", "data ban cua snippets", "data dan cua 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: (((("data van 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: (((("data van cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( data van cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("data van cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.