Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dung hoi » duong hoi, dung hoai, dung thoi
nhan luc » nang luc
hoi cua » hoi chuc
luc tin » duc tin, tuc tin, luc tieng
ve nhan » ve nha, de nhan, va nhan
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang

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: ((te sach) OR (toc sach)) ((ky nang) OR (v nang)) xa hoi. hieu ve nhan luc tin dung hoi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((ky nang) or (v nang)) xa hoi. hieu ve nhan luc tin dung hoi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((ky nang) or (v nang)) xa hoi. hieu ve nhan luc tin dung hoi cua tre*.