Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
quan cau » quang cao, toan cau, quan ha
va trien » va truyen, va thiet, va tuyen
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
danh vi » hanh vi, dinh vi, danh di
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
loc va » hoc va
luc va » duc va, tuc va
vi va » vi van, vai va, vu va

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 sac ky lang xa hoi. hieu quan cau ((loc va) OR (luc va)) danh vi va trien~.
• Adding a wildcard symbol may retrieve word variants: su sac ky lang xa hoi. hieu quan cau ((loc va) or (luc va)) danh vi va trien*.