Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doan hieu so snippets" » "doanh hieu so snippets", "doan dieu so snippets", "doan thien so snippets", "doan thieu so 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: (((("doan hieu 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: (((("doan hieu so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan hieu so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan hieu so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.