Perhaps you should try some spelling variations:
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
ve dat » de dat, va dat, ve dao
vi cua » vai cua, di cua
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 ((ma hoi) or (mai hoi)). hieu ve dat nuoc ((va danh) OR (va hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((ma hoi) OR (mai hoi)). hieu ve dat nuoc ((va danh) OR (va hanh)) vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang ((ma hoi) or (mai hoi)). hieu ve dat nuoc ((va danh) OR (va hanh)) vi cua tre*".