Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
toan cao » toan tap
toan ban » van ban
hoc hat » hoc phat, hoc chat, hoc hai
hoc ha » hoc hoa, hoc hai, hoc ma

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