Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van thai son snippets" » "van thoai son snippets", "van tai son snippets", "van hai son snippets", "van thai den snippets", "van thai do snippets", "van thai hoc 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: (((("van thai 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: (((("van thai son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van thai son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van thai son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.