Perhaps you should try some spelling variations:
"khoi su hoan snippets" » "khoi su code snippets", "khoi su han snippets", "khoi vu hoan snippets", "khoi thu hoan snippets", "khoa su hoan snippets", "hoi su hoan snippets", "thoi su hoan snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data 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: (((("khoi su hoan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoi su hoan snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( khoi su hoan snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoi su hoan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.