Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
tung cua » trung cua, tuong cua, tang cua
dung cua » dung luan, dung cho
cong tac » cong ty
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 thieu xanh - thanh ((tung cua) or (dung cua)) dung ((cong thanh) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh ((tung cua) OR (dung cua)) dung ((cong thanh) OR (cong tac)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh ((tung cua) or (dung cua)) dung ((cong thanh) or (cong tac)) toan cau*.