Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van nang » van quang, van dong, van dung
thuc van » thuc vat, thuc dan, thuc va
hang vi » hang va, hanh vi, khang voi
hang di » hang doi, hang dien, hang dich
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
x hoi » xa hoi, o hoi, x ho
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((van nang) OR (van ban)) x hoi. hieu ve am thuc van ((hang di) or (hang vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((van nang) OR (van ban)) x hoi. hieu ve am thuc van ((hang di) OR (hang vi)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((van nang) OR (van ban)) x hoi. hieu ve am thuc van ((hang di) or (hang vi)) cua triet*".