Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi hoach du snippets" » "thu hoach du snippets", "thi hanh du snippets", "thi hoa du snippets", "thi hoach su snippets", "thi hoach de snippets", "thi hoach do 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: (((("thi hoach du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi hoach du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi hoach du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi hoach du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.