Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
chao tu » chao xu, cho tu, cao tu
ve chao » ve chat, ve cham, ve cho
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang xa) or (nang x)) hoi. hieu ve chao tu va dinh va ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang x)) hoi. hieu ve chao tu va dinh va ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (nang x)) hoi. hieu ve chao tu va dinh va ((cua tre) or (cuu tre))*.