Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
dai luan » bai luan, dan luan, dat luan
thai cua » than cua, tai cuc, tri cua
te sach » toc sach
luan va » luan van, luat va
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, lai cua, bai cua
hai cua » dai cua, hoi cua, lai cua
y nang » ky nang, ly nang, v nang
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 vien dai luan va dinh ((vai cua) or (((hai cua) OR (thai cua)))) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. hieu vien dai luan va dinh ((vai cua) OR (((hai cua) OR (thai cua)))) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. hieu vien dai luan va dinh ((vai cua) or (((hai cua) OR (thai cua)))) tu".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu vien dai luan va dinh ((vai cua) or (((hai cua) OR (thai cua)))) tu*.