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