Perhaps you should try some spelling variations:
xac danh » xac dinh, tac danh, sach danh
nang ma » tang ma, sang ma, nang cao
hieu he » hieu ve, hiem he, hieu le
hiem xe » hiem xa
thu xac » thau xay
hai cua » thai cua, hoi cua, lai cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. ((hieu he) or (hiem xe)) nam thu xac danh ((dai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ma hoi. ((hieu he) OR (hiem xe)) nam thu xac danh ((dai cua) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ma hoi. ((hieu he) or (hiem xe)) nam thu xac danh ((dai cua) or (hai cua)) tre*.