Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tri lieu cho snippets" » "tai lieu cho snippets", "thi lien cho snippets", "tri lieu co snippets", "tri lieu cao snippets", "tri lieu che 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: (((("tri lieu cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tri lieu cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tri lieu cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tri lieu cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.