Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec dai » vien dai, viec tai, viec dat
dai luan » bai luan, dan luan, dat luan
te sach » toc sach
va dinh » van dinh, va tinh, vu dinh
va kinh » va tinh, qua kinh
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang x hoi. hieu viec dai luan ((va dinh) OR (va kinh)) vai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. hieu viec dai luan ((va dinh) OR (va kinh)) vai cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu viec dai luan ((va dinh) OR (va kinh)) vai cua tu*.