Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
dan vat » dang vat, van vat, dan va
va dan » ca dan, va dao, va dau
x hoi » xa hoi, o hoi, 5 hoi
ve am » va am

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (x ho)). hieu ve am thuc va dan vat ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((x hoi) or (x ho)). hieu ve am thuc va dan vat ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) or (x ho)). hieu ve am thuc va dan vat ((cua triet) OR (va triet))*.