Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dao viet toi snippets" » "so viet toi snippets", "o viet toi snippets", "dao viet doi snippets", "dao viet tai snippets", "dao viet tri 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: (((("dao viet toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dao viet toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dao viet toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dao viet toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.