Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
hoc sach » hoc sinh, hoc cac, hoc anh
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y nang ma hoi. hieu ((ve cam) or (ve cac)) xuc va ((dinh viet) or (chinh tri)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang ma hoi. hieu ((ve cam) OR (ve cac)) xuc va ((dinh viet) OR (chinh tri)) cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang ma hoi. hieu ((ve cam) or (ve cac)) xuc va ((dinh viet) or (chinh tri)) cua tre*.