Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
cac thuc » cach thuc, cac thu, can thuc
vien cac » vien bach, vien dai, vien da
mai hoi » mai khoi, dai hoi, lai hoi
thuc va » thuc vat, thuc dan, thuc day
hanh de » hanh ve
ma hoi » xa hoi, ma hoa, me hoi
y nang » ky nang, ly nang, v nang
cua te » cua tu

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: thu sach y nang ((ma hoi) OR (mai hoi)). hieu vien cac thuc va ((hanh de) OR (hanh kem)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((ma hoi) OR (mai hoi)). hieu vien cac thuc va ((hanh de) or (hanh kem)) cua te~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((ma hoi) OR (mai hoi)). hieu vien cac thuc va ((hanh de) or (hanh kem)) cua te*.