Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, toc sach, nuoc sach
cac nuoc » hoc nuoc, dat nuoc, cua nuoc
cap nuoc » dat nuoc
te sach » toc sach
x hoi » xa hoi, o hoi, x ho

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 (doc sach)) ky nang x hoi. lieu va ((cac nuoc) OR (cap nuoc)) ban thanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) ky nang x hoi. lieu va ((cac nuoc) OR (cap nuoc)) ban thanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (doc sach)) ky nang x hoi. lieu va ((cac nuoc) OR (cap nuoc)) ban thanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) ky nang x hoi. lieu va ((cac nuoc) OR (cap nuoc)) ban thanh dai cua triet*.