Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh va » hang va, hanh vi
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
ve bac » ve bao, ve ban, he bac
ve cac » va cac, vien cac
bo van » vo van, so van, do van
va cua » va chua, via cua, ca cua
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((x hoi) or (o hoi)). hieu ((ve bac) or (ve cac)) bo van hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (o hoi)). hieu ((ve bac) OR (ve cac)) bo van hanh va cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) or (o hoi)). hieu ((ve bac) or (ve cac)) bo van hanh va cua triet*.