Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
dam thuc » am thuc, dan thuc, dai thuc
nam thuc » nam thuoc, am thuc, nam thu
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
van anh » van thanh, tuan anh, van minh
anh dai » vanh dai, anh bai, anh dat
y dang » ky dang, 2 dang, _ dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y dang xa hoi. hieu ve ((dam thuc) or (nam thuc)) van anh dai ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y dang xa hoi. hieu ve ((dam thuc) OR (nam thuc)) van anh dai ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y dang xa hoi. hieu ve ((dam thuc) or (nam thuc)) van anh dai ((cua triet) or (su triet))*.