Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
mai hoi » mai khoi, dai hoi, lai hoi
cao duc » dao duc, cao suc, giao duc
tan anh » tuan anh, tran anh, toan anh
cua tre » cua te, cuu tre, dua tren
hieu ve » hieu va, hieu van
ma hoi » xa hoi, ma hoa, me hoi
y nang » ky nang, ly nang, v nang
ve cao » va cao, ve bao, ve cac
anh vi » hanh vi, anh va, anh ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y nang ((ma hoi) OR (mai hoi)). hieu ve cao duc tan anh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang ((ma hoi) OR (mai hoi)). hieu ve cao duc tan anh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang ((ma hoi) OR (mai hoi)). hieu ve cao duc tan anh vi ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ((ma hoi) OR (mai hoi)). hieu ve cao duc tan anh vi ((cua tre) or (cua triet))*.