Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cam truc » nam truc, lam truoc, nam truoc
vu sach » vu bach, su sach, vu khach
hanh di » hanh vi, hanh de, hang di
sach va » sach xa, sach ha, sach dao
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
di cua » dai cua, doi cua, de cua

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

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