Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khi toi tre snippets" » "khi doi tre snippets", "khi hoi tre snippets", "khi moi tre snippets", "khi tuoi tre snippets", "khi toi te snippets", "khi thi tren 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: (((("khi toi tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khi toi tre snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khi toi tre snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khi toi tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.