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