Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dai luan » bai luan, dan luan, dau luan
dat luan » dan luan, dau luan, dat quang
te sach » toc sach
va dinh » van dinh, va kinh, va tinh
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai 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) OR (dat luan)) va dinh ((vai cua) or (hai 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) OR (dat luan)) va dinh ((vai cua) OR (hai 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) OR (dat luan)) va dinh ((vai cua) or (hai cua)) tu".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu vien ((dai luan) OR (dat luan)) va dinh ((vai cua) or (hai cua)) tu*.