Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thu sach » thuat sach, thuoc sach, thu hoach
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
tu sach » su sach, te sach, tu cach
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) OR (thu sach)) lo nang x hoi. hieu van nam thuc va ((hanh di) or (hanh de)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) lo nang x hoi. hieu van nam thuc va ((hanh di) OR (hanh de)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) lo nang x hoi. hieu van nam thuc va ((hanh di) or (hanh de)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) lo nang x hoi. hieu van nam thuc va ((hanh di) or (hanh de)) cua triet*.