Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den hanh moi snippets" » "den thanh moi snippets", "dan hanh moi snippets", "deu hanh moi snippets", "den hanh noi snippets", "den hanh mot 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: (((("den hanh moi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den hanh moi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den hanh moi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den hanh moi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.