Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec bai » viec ban, viec tai, viec bao
bai luan » bai toan, li luan, vay luan
te sach » toc sach
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, bai cua, mai cua
lai cua » hai cua, lai chau, thai 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: te sach y nang xa hoi. hieu viec bai luan va dinh ((((vai cua) or (dai cua))) or (lai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. hieu viec bai luan va dinh ((((vai cua) OR (dai cua))) OR (lai cua)) tu.
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. hieu viec bai luan va dinh ((((vai cua) or (dai cua))) or (lai cua)) tu*.