Perhaps you should try some spelling variations:
va trinh » van trinh, lap trinh, qua trinh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
van hac » van hoc, van ha, van hai
van cac » van cau, van bac, dan cac
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
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: su sach ky tang xa hoi. hieu ((van cac) OR (van hac)) loc ((va trinh) OR (va tinh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang xa hoi. hieu ((van cac) OR (van hac)) loc ((va trinh) or (va tinh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang xa hoi. hieu ((van cac) OR (van hac)) loc ((va trinh) or (va tinh)) vi cua tre*.