Perhaps you should try some spelling variations:
cuu tre » cua tre, cau tren, cau treo
ky dang » ky danh
tai cuu » tai cuc, tai buu, tai cua
van hoc » van hoa
va dung » van dung, va duong, vat dung
thuc va » thuc vat, thuc dan, thuc day
tu sac » tu sach, tu cac, tu san
va cao » va cac, va co, va dao
va cam » va cham, va cac, va cai

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) OR (ky nang)) van hoc. hieu ((va cam) or (va cao)) thuc va dung tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky dang) OR (ky nang)) van hoc. hieu ((va cam) OR (va cao)) thuc va dung tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky dang) OR (ky nang)) van hoc. hieu ((va cam) or (va cao)) thuc va dung tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky dang) OR (ky nang)) van hoc. hieu ((va cam) or (va cao)) thuc va dung tai cuu tre*.