Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
su sach » so sach, vu sach
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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 ((ty nang) OR (ky nang)) xa hoi. hieu va cam xuc va ((dinh viet) or (danh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ky nang)) xa hoi. hieu va cam xuc va ((dinh viet) OR (danh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ky nang)) xa hoi. hieu va cam xuc va ((dinh viet) or (danh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) OR (ky nang)) xa hoi. hieu va cam xuc va ((dinh viet) or (danh di)) cua tre*.