Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
canh trang » canh tranh, hanh trang, banh trang
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, hien khanh
trang va » tran van, hang va
cong san » cong tac
toan cao » toan tap
toan ban » van 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) OR (chieu xanh)) - canh trang va nhung cong san ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu xanh)) - canh trang va nhung cong san ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (chieu xanh)) - canh trang va nhung cong san ((toan cao) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (chieu xanh)) - canh trang va nhung cong san ((toan cao) or (toan ban))*.