Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hien xanh » hien hanh, chieu xanh, hien khanh
tong cong » trong cong, cong cong, dung cong
quang cao » nang cao, quang nam
tranh va » tranh van, trang va, trinh va
cong san » cong tac
quan cau » toan cau, quan ha, quan cua
va tong » va thong, va tuong, va trong

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 xanh) or (hien nhanh)) - canh tranh va tong cong san ((quan cau) OR (quang cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - canh tranh va tong cong san ((quan cau) OR (quang cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien nhanh)) - canh tranh va tong cong san ((quan cau) OR (quang cao))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - canh tranh va tong cong san ((quan cau) OR (quang cao))*.