Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
canh tinh » hanh tinh, canh tranh, nhanh tinh
manh tinh » man tinh, manh binh, hanh tinh
dung cong » dung trong
yen tinh » tuyen tinh
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
ho yen » o yen, chao yen, hong yen

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho yen tinh - ((canh tinh) or (manh tinh)) va ((nhung cong) OR (dung cong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho yen tinh - ((canh tinh) OR (manh tinh)) va ((nhung cong) OR (dung cong)) van toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho yen tinh - ((canh tinh) or (manh tinh)) va ((nhung cong) OR (dung cong)) van toan cao".
• Adding a wildcard symbol may retrieve word variants: ho yen tinh - ((canh tinh) or (manh tinh)) va ((nhung cong) OR (dung cong)) van toan cao*.