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