Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hien hanh » dieu hanh
hanh hinh » hanh chinh, hanh tinh, hanh dinh
cua thong » cua thuong, cua khong, cua tong
thong van » thong va, thong quan, truong van
trong van » trong cac
hinh cua » chinh cua, sinh cua, tinh cua
toan cau » 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 hanh) or (chieu xanh)) - hanh hinh cua thong ((thong van) OR (trong van)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (chieu xanh)) - hanh hinh cua thong ((thong van) OR (trong van)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien hanh) or (chieu xanh)) - hanh hinh cua thong ((thong van) OR (trong van)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (chieu xanh)) - hanh hinh cua thong ((thong van) OR (trong van)) toan cau*.