Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cac quoc » cac nuoc, cac cuoc, cao quoc
quoc ban » quoc bao, quoc lan, quoc quan
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (vu bach)) ky lang xa hoi. hieu ve cac quoc ban hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu bach)) ky lang xa hoi. hieu ve cac quoc ban hanh vai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu bach)) ky lang xa hoi. hieu ve cac quoc ban hanh vai cua triet*.