Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » thong cong, hang cong, nhung don
hien manh » hien hanh, tien manh, hieu manh
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
sat phan » sat nhan, vat phan, xuat phan
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien manh - canh trinh va ((nhung cong) OR (dung cong)) sat phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien manh - canh trinh va ((nhung cong) OR (dung cong)) sat phan dau".
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - canh trinh va ((nhung cong) OR (dung cong)) sat phan dau*.