Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
toc sach » hoc sach, doc sach, thuoc sach
vien cac » vien bach, vien dai, vien da
su tien » su kien, tu tieng, dau tien
van anh » van thanh, tuan anh, van minh
dac van » cac van, dao van, dam van
cac dac » cac dan, cac dai, cac bac
su hien » su kien, thu hien, nhu hien
anh vi » hanh vi, anh va, anh ve
v nang » va nang, vu nang, van nang
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: toc sach ((v nang) or (cam nang)) x hoi. hieu vien cac dac van anh vi ((su tien) OR (su hien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (cam nang)) x hoi. hieu vien cac dac van anh vi ((su tien) OR (su hien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((v nang) or (cam nang)) x hoi. hieu vien cac dac van anh vi ((su tien) OR (su hien))*".