Perhaps you should try some spelling variations:
va phuong » va thuong, cac phuong
xa huong » xa phuong, va huong, xa muong
so sach » so sanh, bo sach, co sach
cam tuc » cam xuc, cam tu, nam thuc
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((nang xa) or (nang ma)) hoi. hieu ve cam tuc ((xa huong) or (va phuong)) dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cam tuc ((xa huong) OR (va phuong)) dai cuu tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang xa) or (nang ma)) hoi. hieu ve cam tuc ((xa huong) or (va phuong)) dai cuu tre*.