Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
tung cua » trung cua, tuong cua, tang cua
dung cua » dung luan, dung cho
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » toan cau, phan cau, than cap

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)) tong ((cong dan) or (cong san)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh ((tung cua) OR (dung cua)) tong ((cong dan) OR (cong san)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh ((tung cua) OR (dung cua)) tong ((cong dan) or (cong san)) than cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh ((tung cua) OR (dung cua)) tong ((cong dan) or (cong san)) than cau*.