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
cua viet » ca viet, hoa viet, cua dieu
cao hoi » cau hoi, co hoi, cao hoc
hieu le » hieu ve, hieu he, hieu ly
va hanh » va thanh, va danh, ban hanh
le nha » le nhat, ke nha, ly nha
nha tu » nhat tu, nhanh tu, nghia tu

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 cao hoi. hieu le nha tu ((va hanh) OR (van hanh)) di ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang cao hoi. hieu le nha tu ((va hanh) OR (van hanh)) di ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ky nang cao hoi. hieu le nha tu ((va hanh) OR (van hanh)) di ((cua viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang cao hoi. hieu le nha tu ((va hanh) OR (van hanh)) di ((cua viet) or (cua vat))*.