Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet cua du snippets" » "viec cua du snippets", "viet ca du snippets", "viet qua du snippets", "viet cua duc snippets", "viet cua ndu snippets", "viet cua su 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 cua du 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 cua du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet cua du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet cua du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.