Perhaps you should try some spelling variations:
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cuu tre, cua triet, dua tren
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
cua te » cua tu
nuoc » quoc, duoc, ngoc

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 cao hoi. ((hieu va) or (hieu qua)) dat nuoc va danh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang cao hoi. ((hieu va) OR (hieu qua)) dat nuoc va danh vi ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang cao hoi. ((hieu va) or (hieu qua)) dat nuoc va danh vi ((cua tre) OR (cua te))*".