Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet voi can snippets" » "viec voi can snippets", "viet doi can snippets", "viet duoi can snippets", "viet voi cac snippets", "viet voi cong snippets", "viet voi hang 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 voi can 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 voi can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet voi can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet voi can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.