Perhaps you should try some spelling variations:
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
hang ve » hang va, hanh ve, hang ke
cam luc » cau luc
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 y ((nang xa) or (nang x)) hoi. hieu ve ((cam luc) or (cam xuc)) ban hang ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cam luc) OR (cam xuc)) ban hang ve cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (nang x)) hoi. hieu ve ((cam luc) or (cam xuc)) ban hang ve cua tre*.