Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hanh tai » thanh tai, hang tai, han tai
ban hanh » ban hang
cac quoc » cac cuoc, cao quoc, han quoc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
tai cua » thai cua, tai cuc, tri cua
te sach » toc sach

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) OR (cac nuoc)) ban hanh 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) OR (cac nuoc)) ban hanh 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) OR (cac nuoc)) ban hanh tai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu bach)) ky nang xa hoi. hieu ve ((cac quoc) OR (cac nuoc)) ban hanh tai cua triet*.