Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
vu sach » vu bach, su sach, vu khach
so sanh » do sanh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sanh)) ky lang xa hoi. hieu va giao duc va ((danh vi) or (dinh viet)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sanh)) ky lang xa hoi. hieu va giao duc va ((danh vi) OR (dinh viet)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sanh)) ky lang xa hoi. hieu va giao duc va ((danh vi) or (dinh viet)) cua tre*.