Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach hoi » sach doi, sach moi, cach thoi
hoi nang » hoi lang, ho nang, hoa nang
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
hanh de » hanh ve, hanh kem
danh di » danh du, xanh di, danh dien
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hang di, xanh di
thuc va » thuc vat, thuc dan, thuc day
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: tu sach hoi nang x hoi. hieu van nam thuc va ((((hanh di) OR (danh di))) or (hanh de)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi nang x hoi. hieu van nam thuc va ((((hanh di) OR (danh di))) OR (hanh de)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoi nang x hoi. hieu van nam thuc va ((((hanh di) OR (danh di))) or (hanh de)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach hoi nang x hoi. hieu van nam thuc va ((((hanh di) OR (danh di))) or (hanh de)) cua triet*.