Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu tach » thien hach, chiet tach, chieu sach
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
tan phan » toan phan, than phan, tai phan
van phan » van phong, van thanh, luan phan

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

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