Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
sach doi » sach hoi, sach dao, sach bai
hieu van » hieu va, thien van, lieu va
sach moi » sach hoi, bach mai, sach bai
va danh » va dinh, va dan, va hanh
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach doi) OR (sach moi)) nang x hoi. hieu van nam thuc ((va danh) or (gia thanh)) di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach doi) OR (sach moi)) nang x hoi. hieu van nam thuc ((va danh) OR (gia thanh)) di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach doi) OR (sach moi)) nang x hoi. hieu van nam thuc ((va danh) or (gia thanh)) di cua triet".
• Adding a wildcard symbol may retrieve word variants: so ((sach doi) OR (sach moi)) nang x hoi. hieu van nam thuc ((va danh) or (gia thanh)) di cua triet*.