Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tinh vai » tinh va, tinh hai, tinh bai
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
cham lo » cham o, cham soc, cham hoi
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 7 tang, 5 tang
cam lo » nam lo, cam ly, cam o

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: thu sach ((y tang) OR (6 tang)) ma hoi. lieu va ((cham lo) OR (cam lo)) va tinh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y tang) OR (6 tang)) ma hoi. lieu va ((cham lo) or (cam lo)) va tinh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y tang) OR (6 tang)) ma hoi. lieu va ((cham lo) or (cam lo)) va tinh vai cua tre*.