Perhaps you should try some spelling variations:
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
su tien » su kien, su hien, tu tieng
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang cao hoi. hieu va cam tu ((va hanh) or (va danh)) va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang cao hoi. hieu va cam tu ((va hanh) OR (va danh)) va su tien.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang cao hoi. hieu va cam tu ((va hanh) or (va danh)) va su tien*.