Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khat nhat de snippets" » "pham nhat de snippets", "hat nhan de snippets", "khau nhap de snippets", "khat nhat ve snippets", "khat nhat le snippets", "khat chat deo 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: (((("khat nhat de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khat nhat de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khat nhat de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khat nhat de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.