Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dao viet ve snippets" » "so viet ve snippets", "o viet ve snippets", "dao biet ve snippets", "dao viet va snippets", "dao viet viet 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 ve 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 ve snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dao viet ve snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dao viet ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.