Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nuoc ban » nuoc san, quoc ban, buoc ban
ban hanh » ban hang
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi 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 nang xa hoi. hieu ve cac nuoc ban hanh ((vai cua) OR (hai 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 nuoc ban hanh ((vai cua) OR (hai 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 nuoc ban hanh ((vai cua) OR (hai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu bach)) ky nang xa hoi. hieu ve cac nuoc ban hanh ((vai cua) OR (hai cua)) triet*.