Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"trac do ngoc snippets" » "trac ho ngoc snippets", "trac dia ngoc snippets", "trac hoc ngoc snippets", "trac duc ngoc snippets", "trac do nguoi snippets"

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

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