Perhaps you should try some spelling variations:
ninh viet » sinh vien, anh viet
hieu vien » hieu hien, hieu viec, thieu nien
cau treo » cau theo, cau tren, cau triet
vien cac » vien bach, vien dai, vien da
toc sach » hoc sach, doc sach, thuoc sach
xang xa » lang xa, mang xa, ang xa
cac duc » cac du, cao duc, cac dac
va ninh » van ninh, va kinh, va tinh
cuu tre » cua tre, cau tren

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) OR (toc sach)) ty xang xa hoi. hieu vien cac duc va ninh viet ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty xang xa hoi. hieu vien cac duc va ninh viet ((cuu tre) OR (cau treo))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty xang xa hoi. hieu vien cac duc va ninh viet ((cuu tre) or (cau treo))*".