Perhaps you should try some spelling variations:
"do moi chieu snippets" » "do moi code snippets", "do doi chieu snippets", "do moi hieu snippets", "do mot chieu snippets", "doi moi 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: (((("do moi 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: (((("do moi chieu snippets") OR ("python using data snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( do moi chieu snippets ) or ( python using data snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("do moi chieu snippets") or ("python using data snippets"))) or ("locating bug core snippets"))*.