Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet da cho snippets" » "viet dao cho snippets", "viet dat cho snippets", "viet ha cho snippets", "viet dac cho snippets", "viet day cho snippets", "viet dan cho 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: (((("viet da cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet da cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet da cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet da cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.