Perhaps you should try some spelling variations:
dang hoai » dang hai, dang loai, dung hoai
dang hoa » dang khoa, dong hoa, hang hoa
cua tre » cua te, cuu tre, cua triet
tuan vi » quan vi, luan vi, quans vi
hieu va » lieu va, hieu qua
sac ky » cac ky, sai ky
va cao » va cac, va co, va dao
so anh » so sanh, so danh, ho anh
do anh » do sanh, do danh
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((dang hoa) or (dang hoai)) hoi. hieu va cao ((so anh) OR (do anh)) tuan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((dang hoa) OR (dang hoai)) hoi. hieu va cao ((so anh) OR (do anh)) tuan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((dang hoa) or (dang hoai)) hoi. hieu va cao ((so anh) OR (do anh)) tuan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((dang hoa) or (dang hoai)) hoi. hieu va cao ((so anh) OR (do anh)) tuan vi cua tre*.