Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
minh anh » minh danh, hinh anh
manh anh » anh anh, thanh anh, manh binh
cua tre » cua te, cuu tre, cua triet
van cao » van dao, van bao, van hao
cao duc » dao duc, cao suc, giao duc
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
va cua » va chua, via cua, ca cua
song y » dong y, song _, song ray

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat song y nang ((ma hoi) or (ma hoa)). hieu van cao duc ((manh anh) OR (minh anh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat song y nang ((ma hoi) OR (ma hoa)). hieu van cao duc ((manh anh) OR (minh anh)) va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat song y nang ((ma hoi) or (ma hoa)). hieu van cao duc ((manh anh) OR (minh anh)) va cua tre*".