Perhaps you should try some spelling variations:
thanh trung » thanh tung
toan thiet » hoan thien, luan thiet, toan tien
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
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 thiet) or (toan thiet)) tach - thanh trung cua nhung ((cong dan) OR (cong san)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (toan thiet)) tach - thanh trung cua nhung ((cong dan) OR (cong san)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) or (toan thiet)) tach - thanh trung cua nhung ((cong dan) OR (cong san)) than cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (toan thiet)) tach - thanh trung cua nhung ((cong dan) OR (cong san)) than cau*.