Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky dang, ky tang, duy sang
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky nang)) ((ma hoi) OR (mai hoi)). hieu ve cac xuc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) or (ky nang)) ((ma hoi) OR (mai hoi)). hieu ve cac xuc va hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) or (ky nang)) ((ma hoi) OR (mai hoi)). hieu ve cac xuc va hanh vi cua tre*.