Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien coc » vien cac, vien co, dien cuc
danh bat » doanh bat, anh bai
tu sach » thu sach, su sach, te sach
ky dang » ky danh
dinh ba » dinh gia, dinh van, dinh lam
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky nang) or (ky dang)) xa hoi. hieu vien coc luc va ((danh bat) or (dinh ba)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky nang) OR (ky dang)) xa hoi. hieu vien coc luc va ((danh bat) OR (dinh ba)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky nang) or (ky dang)) xa hoi. hieu vien coc luc va ((danh bat) or (dinh ba)) cua tre*.