Perhaps you should try some spelling variations:
te sach » toc sach
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
cac dac » cac dan, cac dai, cac bac
cac duc » cac du, cao duc, cac nuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
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: te sach ((ty nang) OR (ty hang)) xa hoi. hieu ve ((cac duc) OR (cac dac)) va dinh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) or (ty hang)) xa hoi. hieu ve ((cac duc) OR (cac dac)) va dinh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) or (ty hang)) xa hoi. hieu ve ((cac duc) OR (cac dac)) va dinh vi cua tre*.