Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
cam tuc » cam xuc, cam tu, nam thuc
lo nang » ho nang, ly nang, loai nang
van cam » van nam, van lam, van cau
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: ((te sach) or (toc sach)) lo nang x hoi. hieu van cam tuc ((va hanh) OR (van hanh)) di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) lo nang x hoi. hieu van cam tuc ((va hanh) OR (van hanh)) di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) lo nang x hoi. hieu van cam tuc ((va hanh) OR (van hanh)) di cua viet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) lo nang x hoi. hieu van cam tuc ((va hanh) OR (van hanh)) di cua viet*.