Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"liem han du snippets" » "liem ha du snippets", "liem thanh du snippets", "liem chau du snippets", "liem han dau snippets", "liem van du snippets", "liem han tu 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: (((("liem han du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("liem han du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( liem han du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("liem han du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.