Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
lo nang » ho nang, ly nang, loai nang
va hanh » van hanh, va thanh, va danh
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: tu sach lo nang x hoi. hieu van nam thuc ((va hanh) or (ban thanh)) di cua 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) OR (ban thanh)) di cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach lo nang x hoi. hieu van nam thuc ((va hanh) or (ban thanh)) di cua triet*.