Perhaps you should try some spelling variations:
"co tam chieu snippets" » "co tam code snippets", "co tim hieu snippets", "co nam chien snippets", "co thi chieu snippets", "cho tam chieu snippets", "co ta chieu snippets", "co tay chieu snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using data snippets" » "python using java snippets", "python using sat snippets", "python missing 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: (((("co tam chieu snippets") or ("python using data snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("co tam chieu snippets") OR ("python using data snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( co tam chieu snippets ) or ( python using data snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("co tam chieu snippets") or ("python using data snippets"))) or ("locating bug core snippets"))*.