Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
canh trinh » canh tranh, hanh trinh, canh tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
dang cong » dung cong
trinh vu » trinh va, trinh ve, trinh vi
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan ban
toan tai » doanh tai, toan ban, toan cao
toan tap » toan ban
vu dang » su dang, vu quang, cua dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu xanh - canh trinh vu dang cong dan ((((toan cau) OR (toan tai))) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - canh trinh vu dang cong dan ((((toan cau) OR (toan tai))) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu xanh - canh trinh vu dang cong dan ((((toan cau) OR (toan tai))) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - canh trinh vu dang cong dan ((((toan cau) OR (toan tai))) or (toan tap))*.