Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
chinh cau » chinh chau, chinh ca, chinh can
cua tong » cua cong, cua dong, cua nong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
chan cau » phan cau, can cau, nhanh cau

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