Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
dang xay » dang van, van xay
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va kinh » va tinh, qua kinh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
ve cac » va cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty dang xay hoi. hieu ((ve cac) or (vien cac)) xuc ((va kinh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty dang xay hoi. hieu ((ve cac) OR (vien cac)) xuc ((va kinh) OR (ban hanh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty dang xay hoi. hieu ((ve cac) or (vien cac)) xuc ((va kinh) or (ban hanh)) vai cua tre*.