Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
van hanh » van thanh, ban hanh, van anh
doi nang » dai nang, hoi nang, voi nang
cau treo » cau theo, cau tren, cau trieu
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
sach doi » sach hoi, sach moi, sach dao
tu sach » thu sach, su sach, te sach
va hanh » va thanh, va danh, ban hanh
van cac » van hac, van cau, van bac
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 doi nang x hoi. hieu van cac nuoc ((va hanh) or (van hanh)) ve ((cau treo) or (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi nang x hoi. hieu van cac nuoc ((va hanh) OR (van hanh)) ve ((cau treo) OR (cau triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach doi nang x hoi. hieu van cac nuoc ((va hanh) or (van hanh)) ve ((cau treo) or (cau triet))*.