Perhaps you should try some spelling variations:
"thi hanh dao snippets" » "thi thanh dao snippets", "thi lanh dao snippets", "thi thanh dat snippets", "thi thanh dam snippets", "thi hanh dao slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "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 hanh dao snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi hanh dao snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi hanh dao snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi hanh dao snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.