Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dai luan » bai luan, dan luan, dat luan
dinh vai » dinh van, dinh vi, dinh va
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
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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