Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"using java java snippets" » "using data java snippets"
"vi trinh xac slippery" » "vi trinh xay slippery", "vi trinh cac slippery", "vi trinh xuan slippery", "vi tinh xac slippery", "va trinh xac slippery", "viet trinh xac slippery", "vi trinh xac slippers"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"vi trinh xac slippery\") OR (\"using java java snippets\"))) OR (\"locating bug core snippets\"))~".
• Removing quotes may allow a broader search: (((( vi trinh xac slippery ) OR ( using java java snippets ))) OR ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("vi trinh xac slippery") OR ("using java java snippets"))) OR ("locating bug core snippets"))*.