Perhaps you should try some spelling variations:
"missing data a snippets" » "using data a snippets", "missing data _ snippets", "missing data 4 snippets"
"hai luong code snippets" » "hai luong cong snippets", "hai luong che snippets", "hai duong code snippets", "hai long code snippets", "dai luong code snippets"
"locating bug core snippets" » "locating bug code snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("missing data a snippets") or ("hai luong code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("missing data a snippets") OR ("hai luong code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( missing data a snippets ) or ( hai luong code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("missing data a snippets") or ("hai luong code snippets"))) or ("locating bug core snippets"))*.