Perhaps you should try some spelling variations:
"hoa thieng o snippets" » "hoan thien o snippets", "hoa hien o snippets", "hoa thiet o snippets", "hoa tieng o snippets", "hoa thien _ snippets", "hoa thong o snippets"
"python using java snippets" » "python using data 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: (((("hoa thieng o snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoa thieng o snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoa thieng o snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoa thieng o snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.