Perhaps you should try some spelling variations:
doanh cua » doanh luan
hieu vien » hieu hien, hieu viec, thieu nien
su sach » so sach, vu sach
va tinh » may tinh
vu nang » vuc nang, va nang, vu dang
cac tuc » cac toc, cac tu, cac nuoc
sach vu » sach va, sach tu, sach uu
cac tac » cac toc, cac bac, cac dac
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: su sach vu nang x hoi. hieu vien ((cac tuc) OR (cac tac)) ((va tinh) or (gia thanh)) doanh cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach vu nang x hoi. hieu vien ((cac tuc) OR (cac tac)) ((va tinh) OR (gia thanh)) doanh cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach vu nang x hoi. hieu vien ((cac tuc) OR (cac tac)) ((va tinh) or (gia thanh)) doanh cua tu".
• Adding a wildcard symbol may retrieve word variants: su sach vu nang x hoi. hieu vien ((cac tuc) OR (cac tac)) ((va tinh) or (gia thanh)) doanh cua tu*.