Perhaps you should try some spelling variations:
"creating duc toan snippets" » "creating duc code snippets", "creating _ toan snippets", "creating duc tan snippets", "creating duc ton snippets", "creating duc hoan snippets"
"locating bug core snippets" » "locating bug code snippets"
"creating a a snippets" » "creating _ a snippets", "reading a a snippets"

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

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