Perhaps you should try some spelling variations:
sieu viet » su viet, dien viet, bien viet
hieu viec » nhieu viec, hieu ve, hieu hien
toc sach » hoc sach, doc sach, thuoc sach
dinh vai » dinh van, dinh vi, dinh va
luan va » luan van
luat va » xuat va, luat ve, suat va
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang xa hoi. ((hieu viec) or (sieu viet)) dat ((luan va) or (luat va)) dinh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. ((hieu viec) OR (sieu viet)) dat ((luan va) OR (luat va)) dinh vai cua tu.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. ((hieu viec) or (sieu viet)) dat ((luan va) or (luat va)) dinh vai cua tu*.