Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
tinh cua » trinh cua, sinh cua, tinh chat
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((tinh cua) OR (trinh luat)) dung cong tan ((toan cau) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((tinh cua) or (trinh luat)) dung cong tan ((toan cau) or (toan ban))*.