Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
nhan luc » nang luc
van nhan » van phan, van thanh, danh nhan
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
su sach » so sach
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
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) or (((su sach) OR (vu sach)))) v nang xa hoi. hieu van nhan luc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((su sach) OR (vu sach)))) v nang xa hoi. hieu van nhan luc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((su sach) OR (vu sach)))) v nang xa hoi. hieu van nhan luc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((su sach) OR (vu sach)))) v nang xa hoi. hieu van nhan luc va hanh vai cua tre*.