Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di 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 khach ky ((nang xa) or (lang xa)) hoi. hieu ve ((pham duc) or (chao xu)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky ((nang xa) OR (lang xa)) hoi. hieu ve ((pham duc) OR (chao xu)) van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu khach ky ((nang xa) or (lang xa)) hoi. hieu ve ((pham duc) or (chao xu)) van hanh vi cua tre*.