Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
quoc ban » quoc bao, quoc lan, quoc quan
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
cac quoc » cac nuoc, cac cuoc, cao quoc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
te sach » toc sach
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 nang xa hoi. hieu ve cac quoc ban ((hanh tai) OR (hang tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu bach)) ky nang xa hoi. hieu ve cac quoc ban ((hanh tai) OR (hang tai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu bach)) ky nang xa hoi. hieu ve cac quoc ban ((hanh tai) OR (hang tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu bach)) ky nang xa hoi. hieu ve cac quoc ban ((hanh tai) OR (hang tai)) cua triet*.