Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet duc doi snippets" » "viet dung doi snippets", "viet duc dai snippets", "viet duc loi snippets", "viet luc doi 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 duc doi 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 duc doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet duc doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet duc doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.