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
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, dia danh
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, ban hanh
van dat » van dao, van dau, dan dat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
nuoc » quoc, duoc, ngoc

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 ((va hanh) or (va danh)) 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 ((va hanh) OR (va danh)) di ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ky lang xa hoi. hieu van dat nuoc ((va hanh) or (va danh)) di ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu khach ky lang xa hoi. hieu van dat nuoc ((va hanh) or (va danh)) di ((cua tre) OR (cuu tre))*.