Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lan thuy do snippets" » "lan thu do snippets", "van thuy do snippets", "tran thuy do snippets", "lan thuyet do snippets", "lan thay doi snippets", "lan thuat do 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: (((("lan thuy do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lan thuy do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lan thuy do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan thuy do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.