Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"pha hoc de snippets" » "pha hoc code snippets", "phap hoc de snippets", "phau hoc de snippets", "nha hoc de snippets", "pha hoc he snippets", "pha hoc te snippets", "pha hoc do snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("pha hoc de snippets") OR ("python missing data snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"pha hoc de snippets\") OR (\"python missing data snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( pha hoc de snippets ) OR ( python missing data snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pha hoc de snippets") OR ("python missing data snippets"))) OR ("locating bug core snippets"))*.