Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cua triet, dua tren
va hanh » va thanh, va danh, ban hanh
cuu tre » cau tren, cau treo
van dat » van dao, van dau, dan dat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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 lang xa hoi. hieu van dat nuoc ((van hanh) or (va hanh)) di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky lang xa hoi. hieu van dat nuoc ((van hanh) OR (va hanh)) di ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu khach ky lang xa hoi. hieu van dat nuoc ((van hanh) or (va hanh)) di ((cua tre) or (cuu tre))*.