Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phap van tre snippets" » "pham van tre snippets", "phan van tre snippets", "phap han tre snippets", "phap van tren snippets", "phap van te snippets", "phap ban tre 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: (((("phap van tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phap van tre snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phap van tre snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phap van tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.