Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » toan cau, phan cau, than cap
can ban » van ban, toan 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 thieu xanh - ((thanh trung) or (thanh tung)) can ban ((cong dan) OR (cong san)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((thanh trung) OR (thanh tung)) can ban ((cong dan) OR (cong san)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((thanh trung) or (thanh tung)) can ban ((cong dan) OR (cong san)) than cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((thanh trung) or (thanh tung)) can ban ((cong dan) OR (cong san)) than cau*.