Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nhan van tre snippets" » "nhan dan tre snippets", "nhan va tre snippets", "phan van tre snippets", "nhan van tren snippets", "nhan van te snippets", "nhan 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: (((("nhan 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: (((("nhan van tre snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhan van tre snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhan van tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.