Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
lo nang » ho nang, ly nang, loai nang
thuc va » thuc vat, thuc dan, thuc day
hanh di » hanh vi, hang di, danh di
hanh de » hanh ve, hanh kem
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 lo nang x hoi. hieu van nam thuc va ((hanh di) or (hanh de)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach lo nang x hoi. hieu van nam thuc va ((hanh di) OR (hanh de)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach lo nang x hoi. hieu van nam thuc va ((hanh di) or (hanh de)) su triet*.