Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, thieu nien, hieu tieng
cac truc » cau truc, cac tru, cac trung
su sach » so sach, vu sach
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
co sach » bo sach, cuon sach, hoc sach
de cua » le cua, te cua, dieu cua

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) OR (hieu viec)) cac truc va hanh de cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky dang xa hoi. ((hieu vien) OR (hieu viec)) cac truc va hanh de cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky dang xa hoi. ((hieu vien) OR (hieu viec)) cac truc va hanh de cua tre*.