Perhaps you should try some spelling variations:
danh dinh » dang dinh, anh dinh, danh vinh
dinh cuu » dinh chi
hieu va » lieu va, hieu qua
cach tu » cach thuc
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau tren, cau treo
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
cac tu » cac thu, cac du, tac tu
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang ((o hoi) or (co hoi)). hieu va ((cac tu) OR (cach tu)) va danh dinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((o hoi) OR (co hoi)). hieu va ((cac tu) OR (cach tu)) va danh dinh cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang ((o hoi) or (co hoi)). hieu va ((cac tu) OR (cach tu)) va danh dinh cuu tre*".