Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
hoc chiet » hoc nhiet, hoc viet, hoc thieu
hoc thiet » hoc thieu, hoc thuyet, toc thieu
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((hoc chiet) OR (hoc hien))) or (hoc thiet)) tach - thanh trung cua nhung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((hoc chiet) OR (hoc hien))) OR (hoc thiet)) tach - thanh trung cua nhung cong dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((hoc chiet) OR (hoc hien))) or (hoc thiet)) tach - thanh trung cua nhung cong dan van ban".
• Adding a wildcard symbol may retrieve word variants: ((((hoc chiet) OR (hoc hien))) or (hoc thiet)) tach - thanh trung cua nhung cong dan van ban*.