Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu cam » hieu cac, hieu ca, hieu am
dieu cam » dieu can, dieu cua, diem cau
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, tu cach
te sach » toc sach
luc van » luoc van, luu van, duc van
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
o lai » o lao

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 lai. ((hieu cam) OR (dieu cam)) nang luc 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 lai. ((hieu cam) OR (dieu cam)) nang luc van hanh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang o lai. ((hieu cam) OR (dieu cam)) nang luc van hanh vi cua triet*.