Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
hieu ve » hieu van
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
so van » su van, vo van
do van » dao van, vo van
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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: su sach ty nang x hoi. ((hieu ve) OR (hieu va)) bac ((so van) OR (do van)) hanh vi cua triet~.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. ((hieu ve) or (hieu va)) bac ((so van) or (do van)) hanh vi cua triet*.