Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"don viet ca snippets" » "dong viet ca snippets", "doan viet ca snippets", "dan viet ca snippets", "don viet ha snippets", "don viet co snippets", "don viet a 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: (((("don viet ca snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("don viet ca snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( don viet ca snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("don viet ca snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.