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
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
cuu tre » cau tren, cau treo
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
ve cac » va cac, vien cac

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 ((nang xa) OR (nang ma)) hoi. hieu ve cac duc va tinh va ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (nang ma)) hoi. hieu ve cac duc va tinh va ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (nang ma)) hoi. hieu ve cac duc va tinh va ((cua tre) OR (cuu tre))*.