Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
van cao » van dao, van bao, van hao
duc van » duc tan, duc manh, duc phan
y nang » ky nang, ly nang, v nang
ma hoi » xa hoi, ma hoa, me hoi
anh le » manh le, oanh le, anh ve
le cua » ly cua
cua te » cua tu

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 van cao ((duc van) or (duc va)) anh le cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang ((ma hoi) OR (mai hoi)). hieu van cao ((duc van) OR (duc va)) anh le cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang ((ma hoi) OR (mai hoi)). hieu van cao ((duc van) or (duc va)) anh le cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ((ma hoi) OR (mai hoi)). hieu van cao ((duc van) or (duc va)) anh le cua te*.