Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
trung cua » truong cua, trung cap, dung cua
cong hach » cong sach, cong thanh, cong khanh
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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 - hanh ((trung cua) or (trung tuan)) nhung cong hach ((toan cau) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((trung cua) OR (trung tuan)) nhung cong hach ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ((trung cua) or (trung tuan)) nhung cong hach ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((trung cua) or (trung tuan)) nhung cong hach ((toan cau) OR (toan tap))*.