Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
su sach » so sach
cua tre » cua te, cua triet, dua tren
va tinh » may tinh
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
vu sach » vu bach, vu khach
ve cac » va cac, vien cac
cac bo » bac bo, cac co
bo va » bao va, do va, so va
x hoi » xa hoi, o hoi, x ho

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) OR (vu sach)) ky nang x hoi. hieu ve cac bo va tinh vai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky nang x hoi. hieu ve cac bo va tinh vai ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang x hoi. hieu ve cac bo va tinh vai ((cua tre) OR (cuu tre))*.