Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
ve triet » va trien, su triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
toc van » hoc van, tac van, oc van
x hoi » xa hoi, o hoi, x ho
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 ky nang x hoi. hieu viec cac ((toc van) or (toc san)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu viec cac ((toc van) OR (toc san)) hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu viec cac ((toc van) or (toc san)) hanh vi ve triet*.