Perhaps you should try some spelling variations:
dua tren » dung tren
su sach » so sach, vu sach
dung co » dung cho, dung cong, dung cua
va dung » van dung, va duong, vat dung
cam tuc » cam xuc, cam tu, nam thuc
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao

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: su sach ky ((nang xa) OR (nang ma)) hoi. hieu va cam tuc va dung co ((dua tren) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) OR (nang ma)) hoi. hieu va cam tuc va dung co ((dua tren) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) OR (nang ma)) hoi. hieu va cam tuc va dung co ((dua tren) or (cuu tre))*.