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