Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hieu vu » hieu va, hieu ve, hieu su
su sach » so sach, vu sach
te sach » toc sach
vu cham » va cham, vu kham, tu cham
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, x ho
ac va » tac va, bac va, mac va
vi ve » va ve, gi ve, ve ve

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (te sach)) ky nang x hoi. hieu vu cham ((ac va) or (luc va)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang x hoi. hieu vu cham ((ac va) OR (luc va)) hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang x hoi. hieu vu cham ((ac va) or (luc va)) hanh vi ve triet*.