Perhaps you should try some spelling variations:
dang hoa » dang hoai, dang khoa, dong hoa
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
hoa hoi » khoa hoi, hoa hoc, hoa doi
quan li » quan ly, quan tri
quan vi » quan tri, quan doi
tu sac » tu sach, tu cac, tu san
lo anh » le anh, ly anh, do anh
sac ky » cac ky, sai ky
va cao » va cac, va co, va bao
va dao » ca dao

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