Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
toc sach » hoc sach, doc sach, thuoc sach
viec dau » viec dat, viec dang, viec dieu
dau luan » dan luan, dat luan, khau luan
nang xa » nang x, lang xa, nang ma
luan va » luan van, luat va
va dinh » van dinh, va kinh, va tinh
vai cua » hai cua, lai cua, bai cua
y nang » ky nang, ly nang, v nang

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 dau luan va dinh ((vai cua) or (dai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu viec dau luan va dinh ((vai cua) OR (dai cua)) tu.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu viec dau luan va dinh ((vai cua) or (dai cua)) tu*.