Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
truc va » thuc va, thuc vat, trung va
hieu ve » hieu van
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
vi su » va su, ve su, ki su

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) OR (o hoi)). ((hieu ve) OR (hieu va)) cau truc va dinh vi su 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)) cau truc va dinh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: su sai ky nang ((x hoi) OR (o hoi)). ((hieu ve) or (hieu va)) cau truc va dinh vi su triet*.