Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh xuan » trinh quan, trinh luan, trinh luat
xuan thong » xuat thong, xuan thang, xuan truong
hien xanh » hien hanh, hien nhanh, hien khanh
thong tan » thong than, thong tran, thong tin
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: hoc ((hien xanh) OR (chieu xanh)) - canh trinh xuan thong thong tan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu xanh)) - canh trinh xuan thong thong tan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (chieu xanh)) - canh trinh xuan thong thong tan ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (chieu xanh)) - canh trinh xuan thong thong tan ((toan cau) or (toan cao))*.