Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu manh » hieu nganh, dieu hanh, hien hanh
mang lan » mang lai, hang luan, bang luan
mang lam » bang lam, mang lai, mang mam
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chieu xanh)) - anh ((mang lan) OR (mang lam)) phuong cong tac toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chieu xanh)) - anh ((mang lan) OR (mang lam)) phuong cong tac toan cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu xanh)) - anh ((mang lan) OR (mang lam)) phuong cong tac toan cao*.