Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
cam truc » cau truc, nam truc, lam truoc
hieu va » lieu va, hieu qua
hieu ve » hieu van
vi cua » vai cua, di cua
su sai » su tai, su hai, su dai
sai ky » sac ky
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: su sai ky nang ((x hoi) OR (o hoi)). ((hieu ve) or (hieu va)) cam truc van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang ((x hoi) OR (o hoi)). ((hieu ve) OR (hieu va)) cam truc van hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang ((x hoi) OR (o hoi)). ((hieu ve) or (hieu va)) cam truc van hanh vi cua triet*".