Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet day doc snippets" » "viet duy doc snippets", "viet tay doc snippets", "viet da doc snippets", "viet day hoc snippets", "viet dat doc 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 day doc 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 day doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet day doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet day doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.