Perhaps you should try some spelling variations:
tranh xuan » tran xuan, tranh luan, thanh xuan
chieu xanh » chieu sach, chieu sang, chieu tinh
xuan thong » xuat thong, xuan thang, xuan truong
thong cong » trong cong, tong cong, thong thong
hieu xanh » hieu manh, hieu nganh, dieu hanh
cong tan » cong tac, cong san, cong thanh
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) or (chieu xanh)) - canh tranh xuan thong cong tan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - canh tranh xuan thong cong tan ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (chieu xanh)) - canh tranh xuan thong cong tan ((toan cau) or (toan cao))*.