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