Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
dan vai » dan va, dan tai, dan vat
vai cua » dai cua, hai cua, lai cua
sac ky » cac ky, sai ky
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: tu ((sach ky) OR (sac ky)) nang ((x hoi) OR (x ho)). hieu ve am thuc va dan vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang ((x hoi) or (x ho)). hieu ve am thuc va dan vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang ((x hoi) or (x ho)). hieu ve am thuc va dan vai cua triet*.