Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, tong cong, thong thong
ngang toan » nganh toan, dang toan, quang toan
bien tinh » bi tinh, yen tinh, diep tinh
trinh vat » trinh van, trinh luat, sinh vat
toan ban » van ban
ho bien » pho bien, hoa bien, so bien

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: "ho bien tinh - canh trinh vat ((nhung cong) OR (thong cong)) ngang toan ban~".
• Adding a wildcard symbol may retrieve word variants: ho bien tinh - canh trinh vat ((nhung cong) OR (thong cong)) ngang toan ban*.