Perhaps you should try some spelling variations:
trung thanh » truong thanh
khien thich » bien thich, kien trich, khuyen khich
khien tinh » thien tinh, bien tinh, dien tinh
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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 ((khien tinh) OR (khien thich)) - hanh ((trung cua) OR (trung thanh)) dung cong san toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((khien tinh) OR (khien thich)) - hanh ((trung cua) or (trung thanh)) dung cong san toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((khien tinh) OR (khien thich)) - hanh ((trung cua) or (trung thanh)) dung cong san toan ban*.