Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh tai, hanh van
thuc day » thuc dan, thuc vat
thu sach » tu sach, thuat sach, thuoc sach
cau thuc » cau truc, cuu thuc, can thuc
lang xa » lang ha, dang xay, lang van
van cau » van dau, van hau, van chat
nang xa » nang x, nang ma, mang xa
hanh va » hang va, hanh vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang xa) or (lang xa)) hoi. hieu van cau thuc day ((hanh vai) or (hanh va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (lang xa)) hoi. hieu van cau thuc day ((hanh vai) OR (hanh va)) cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) or (lang xa)) hoi. hieu van cau thuc day ((hanh vai) or (hanh va)) cua triet*.