Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luan van oi snippets" » "luan van loi snippets", "luan van noi snippets", "luan van doi snippets", "quan van oi snippets", "lan van oi 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: (((("luan van oi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luan van oi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan van oi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan van oi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.