Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh lai » thanh hai, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
va triet » va trien, ve triet, cua triet
te sach » toc sach
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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

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