Perhaps you should try some spelling variations:
canh trinh » hanh trinh, canh tinh, anh trinh
thong cong » trong cong, tong cong, thong thong
hien manh » hien hanh, tien manh, hieu manh
va thong » va thuong, va phuong, he thong
cong sat » cong suat, cong san, cong hat
phan dau » phan tu
hang dau » hang va, hang tai

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) or (canh tranh)) va thong cong sat ((phan dau) OR (hang dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - ((canh trinh) OR (canh tranh)) va thong cong sat ((phan dau) OR (hang dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien manh - ((canh trinh) or (canh tranh)) va thong cong sat ((phan dau) OR (hang dau))".
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - ((canh trinh) or (canh tranh)) va thong cong sat ((phan dau) OR (hang dau))*.