Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
cuu tre » cau tren, cau treo
du va » dau va, tu va, su va

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: tu sach y ((lang xa) OR (nang ma)) hoi. hieu va cac du va tinh va ((cua tre) OR (cuu tre))~.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) or (nang ma)) hoi. hieu va cac du va tinh va ((cua tre) or (cuu tre))*.