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