Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
truc van » truc va, truc ban, truc dan
thuc van » thuc vat, thuc dan, thuc va
hieu ve » hieu van
hieu va » lieu va, hieu qua
dinh vi » dinh ve, dinh viet, dinh tri
su sai » su tai, su hai, su dai
sai ky » sac ky
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 sai ky nang x hoi. ((hieu ve) OR (hieu va)) cau ((truc van) OR (thuc van)) dinh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang x hoi. ((hieu ve) or (hieu va)) cau ((truc van) OR (thuc van)) dinh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sai ky nang x hoi. ((hieu ve) or (hieu va)) cau ((truc van) OR (thuc van)) dinh vi cua triet*.