Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
ve triet » su triet
dang xay » dang van, van xay
va trien » va truyen, va thiet, va tuyen
anh vai » anh va, anh bai, anh van
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cac tuc » cac toc, cac tac, cac nuoc
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cac tu » cac thu, cach tu, cac du

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu vien ((cac tuc) OR (cac tu)) tuan anh vai ((va trien) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xay hoi. hieu vien ((cac tuc) OR (cac tu)) tuan anh vai ((va trien) or (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu vien ((cac tuc) OR (cac tu)) tuan anh vai ((va trien) or (ve triet))*.