Perhaps you should try some spelling variations:
khien bac » khien ban, khien bang, phien ban
van dinh » van minh, van dich, va dinh
dinh vai » dinh van, dinh vi, dinh va
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
bo van » vo van, so van, do van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ky nang xa hoi. dieu khien bac bo van dinh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky nang xa hoi. dieu khien bac bo van dinh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky nang xa hoi. dieu khien bac bo van dinh vai cua tre*.