Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu ven » hieu van, hieu ve, hieu tren
dung co » dung cho, dung cong, dung cua
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
sac ky » cac ky, sai ky
tu vat » tu van, tu bat, tu dat
co cua » con cua, ca cua, cong cua
so sac » so sach, so dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky dang xa hoi. ((hieu ven) or (hieu hien)) dam ((tu vat) OR (tu va)) dung co cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky dang xa hoi. ((hieu ven) OR (hieu hien)) dam ((tu vat) OR (tu va)) dung co cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky dang xa hoi. ((hieu ven) or (hieu hien)) dam ((tu vat) OR (tu va)) dung co cua tre*".