Perhaps you should try some spelling variations:
thanh ban » thanh san, thanh van, thanh bac
sang kyo » sang ky, sang tao, dang ky
kyo nang » ky nang, khoi nang, ki nang
quoc ban » quoc bao, quoc lan, quoc quan
va triet » va thiet, va trien, ve triet
tu sang » thu sang, tu san, tu lang
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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: tu sang kyo nang x hoi. hieu va cam ((duc van) OR (quoc ban)) thanh ban va triet~.
• Adding a wildcard symbol may retrieve word variants: tu sang kyo nang x hoi. hieu va cam ((duc van) or (quoc ban)) thanh ban va triet*.