Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van bac » van ban, van bao, van hac
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
toc xa » tuc xa, toc ta, hoc xa
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((x hoi) OR (o hoi)). hieu van bac ((toc xa) OR (hoc ma)) hanh vi cua tu~.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((x hoi) or (o hoi)). hieu van bac ((toc xa) or (hoc ma)) hanh vi cua tu*.