Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khanh van he snippets" » "thanh van he snippets", "khanh vinh he snippets", "hanh va he snippets", "khanh van hoe snippets", "khanh van hue snippets", "khanh van de 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: (((("khanh van he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khanh van he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khanh van he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khanh van he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.