Perhaps you should try some spelling variations:
"lich su hoan snippets" » "lich su code snippets", "lich su han snippets", "lich vu hoan snippets", "lich thu hoan snippets", "dich su hoan snippets", "tich su hoan snippets", "linh 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: (((("lich 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: (((("lich su hoan snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( lich su hoan snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lich su hoan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.