Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va thanh » gia thanh, ban thanh, le thanh
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
cac duc » cac du, cao duc, cac dac
te sach » toc sach
va tinh » may tinh
van cac » van hac, van cau, van bac
lai va » loai va, mai va, dai va
x hoi » xa hoi, o hoi, x ho

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) or (te sach)) ky nang x hoi. hieu van cac duc ((va thanh) OR (va tinh)) lai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (te sach)) ky nang x hoi. hieu van cac duc ((va thanh) OR (va tinh)) lai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) or (te sach)) ky nang x hoi. hieu van cac duc ((va thanh) OR (va tinh)) lai va triet".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (te sach)) ky nang x hoi. hieu van cac duc ((va thanh) OR (va tinh)) lai va triet*.