Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan, thuc vat
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
dan dan » dang dan, ban dan, dao dan
dan hai » doan hai, dang hai, dan khai
hai cua » thai cua, dai cua, hoi cua
sac ky » cac ky, sai ky
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 dan dan hai 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 dan dan hai 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 dan dan hai cua triet*.