Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
cac truc » cau truc, cac tru, cac trung
cua tre » cuu tre, cua triet, dua tren
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
co sach » bo sach, cuon sach, hoc sach
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: ((su sach) OR (co sach)) ky dang xa hoi. hieu vien cac truc va hanh de ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky dang xa hoi. hieu vien cac truc va hanh de ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky dang xa hoi. hieu vien cac truc va hanh de ((cua tre) OR (cua te))*.