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