Perhaps you should try some spelling variations:
hieu vien » hieu viec, thieu nien, hieu tieng
hieu hien » bieu hien, dieu hien, chieu chien
toc sach » hoc sach, doc sach, thuoc sach
dai luan » bai luan, dan luan, dat luan
dinh vai » dinh van, dinh vi, dinh va
nang xa » nang x, lang xa, nang ma
luan va » luan van, luat va
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang xa hoi. ((hieu vien) OR (hieu hien)) dai luan va dinh vai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. ((hieu vien) OR (hieu hien)) dai luan va dinh vai cua tu".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. ((hieu vien) OR (hieu hien)) dai luan va dinh vai cua tu*.