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