Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phan viet so snippets" » "phap viet so snippets", "han viet so snippets", "pham viet so snippets", "phan viec so snippets", "phan viet o 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 so 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 so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan viet so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan viet so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.