Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
nang duc » nang luc, nang doc, nang du
hieu dia » hieu gia, lieu dia, hieu qua
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, tu cach
hieu da » hieu dac, hieu va, hieu ca
te sach » toc sach
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
o hai » co hai, so hai, o lai

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang o hai. ((hieu da) OR (hieu dia)) nang duc van hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang o hai. ((hieu da) OR (hieu dia)) nang duc van hanh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang o hai. ((hieu da) OR (hieu dia)) nang duc van hanh vi cua triet*.