Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, thong thong, phong chong
luong toan » luong thanh, truong toan, luong tai
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh vat » trinh van, trinh luat, sinh vat
tong cong » trong cong, cong cong, dung cong
toan cau » toan cao, toan ban, toan tap

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: "hoc hien xanh - hanh trinh vat ((thong cong) OR (tong cong)) luong toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh trinh vat ((thong cong) OR (tong cong)) luong toan cau*.