Perhaps you should try some spelling variations:
thanh trung » thanh tung
cong thanh » cong trinh, cong tan, truong thanh
dong thanh » truong thanh
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
cua trong » cua truong, cua trung, qua trong
so thiet » soc thiet, hoc thiet, hoa thiet
toan ban » van 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) or (so thiet)) tach - thanh trung cua trong ((cong thanh) OR (dong thanh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (so thiet)) tach - thanh trung cua trong ((cong thanh) OR (dong thanh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (so thiet)) tach - thanh trung cua trong ((cong thanh) OR (dong thanh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (so thiet)) tach - thanh trung cua trong ((cong thanh) OR (dong thanh)) toan ban*.