Perhaps you should try some spelling variations:
dinh chi » dinh thi, dinh tri, dinh moi
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
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 ve cac tu va danh ((dinh cuu) OR (dinh chi)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((o hoi) OR (co hoi)). hieu ve cac tu va danh ((dinh cuu) OR (dinh chi)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang ((o hoi) or (co hoi)). hieu ve cac tu va danh ((dinh cuu) OR (dinh chi)) tre*".