Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
hien manh » hien hanh, hieu manh, hien nhanh
tien manh » tien anh, tien thanh, tieng anh
cong suat » nang suat, cong san, cong cua
suat phan » sat phan, xuat phan, thuat phan
trinh va » trinh van, trinh vat, trinh ve
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) OR (tien manh)) - canh trinh va nhung cong suat phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) OR (tien manh)) - canh trinh va nhung cong suat phan dau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien manh) OR (tien manh)) - canh trinh va nhung cong suat phan dau*.