Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, toc sach, nuoc sach
cam quoc » cac quoc, cao quoc, nam quoc
quoc ban » quoc bao, quoc lan, quoc quan
ban hanh » ban hang
te sach » toc sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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 lang) OR (ky tang)) xa hoi. lieu va cam quoc ban hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) ((ky lang) OR (ky tang)) xa hoi. lieu va cam quoc ban hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (doc sach)) ((ky lang) OR (ky tang)) xa hoi. lieu va cam quoc ban hanh vi cua triet*".