Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dao, sach dung
sach duy » sach dung, sach dao, sach dat
sang tao » hang tai
hanh va » hang va
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
tao hoi » tao khoi, tao boi, tay hoi
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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 duy) OR (sach duoc)) sang tao hoi. hieu ve cam duc va ((hanh va) OR (hanh vi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach duy) OR (sach duoc)) sang tao hoi. hieu ve cam duc va ((hanh va) or (hanh vi)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach duy) OR (sach duoc)) sang tao hoi. hieu ve cam duc va ((hanh va) or (hanh vi)) cua tre*.