Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien bai » vien dai, vien tai, vien bach
bai luan » bai toan, li luan, vay luan
te sach » toc sach
luan va » luan van, luat va
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau
y nang » ly nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa

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) OR (ky nang)) ma hoi. hieu vien bai luan va dinh ((vai cua) or (lai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ky nang)) ma hoi. hieu vien bai luan va dinh ((vai cua) OR (lai cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (ky nang)) ma hoi. hieu vien bai luan va dinh ((vai cua) or (lai cua)) tu".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (ky nang)) ma hoi. hieu vien bai luan va dinh ((vai cua) or (lai cua)) tu*.