Perhaps you should try some spelling variations:
tuan hanh » tuan anh, quan hanh, toan hanh
toc sach » hoc sach, doc sach, thuoc sach
luc tuan » luc luan, luc quan, luu tuan
nhan luc » nang luc
van nhan » van phan, van thanh, danh nhan
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cao hoi » cau hoi, co hoi, cao hoc
ly vang » ly hang, ly van, ly quang
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ly vang ((cao hoi) or (co hoc)). hieu van nhan luc tuan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ly vang ((cao hoi) OR (co hoc)). hieu van nhan luc tuan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ly vang ((cao hoi) or (co hoc)). hieu van nhan luc tuan hanh vi cua tre*.