Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tai lieu cho snippets" » "vat lieu cho snippets", "tai lieu co snippets", "tai lieu cao snippets", "tai 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: (((("tai 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: (((("tai lieu cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tai lieu cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tai lieu cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.