Perhaps you should try some spelling variations:
cao hoi » cau hoi, cao hoc, tao hoi
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
va danh » va dinh, va dan, va hanh
hai cua » thai cua, dai cua, lai cua
hoi cua » hoi chuc
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa

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) or (co hoi)). hieu ve cam tuc va danh ((hai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((cao hoi) OR (co hoi)). hieu ve cam tuc va danh ((hai cua) OR (hoi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((cao hoi) or (co hoi)). hieu ve cam tuc va danh ((hai cua) or (hoi cua)) tre*.