Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
danh va » doanh va, hanh va, anh va
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
va cam » va cham, va cao, va 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: so sach ky nang ma hoi. hieu ((va cam) or (va cac)) xuc va ((danh va) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. hieu ((va cam) OR (va cac)) xuc va ((danh va) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. hieu ((va cam) or (va cac)) xuc va ((danh va) or (hanh vi)) cua tre*.