Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
tinh ve » trinh ve, tinh ven, dinh ve
va tinh » may tinh
cam luc » cau luc
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
ve cua » le cua, de cua, te cua

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

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