Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, truong thanh
trong dang » truong dang, trong dan, trong dong
chua nang » chuc nang, chua xang, kha nang
tran tuan » tran xuan, tran quang, tran thanh
dang toan » dang tran, dan toan, dung toan
thu bang » thu ban, thu hang, chu bang
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: ho ((thu bang) OR (chua nang)) - hanh ((trung tuan) OR (tran tuan)) dung trong dang toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((thu bang) or (chua nang)) - hanh ((trung tuan) OR (tran tuan)) dung trong dang toan ban~".
• Adding a wildcard symbol may retrieve word variants: ho ((thu bang) or (chua nang)) - hanh ((trung tuan) OR (tran tuan)) dung trong dang toan ban*.