Perhaps you should try some spelling variations:
thien van » thi van
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
hieu van » hieu va, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
hanh lam » thanh lap, hanh kem, hanh va
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
xu van » tu van, vu van, su van
lam va » nam va, dam va, lam ha
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: su sach tru nang x hoi. ((hieu van) or (thien van)) chao xu van hanh lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tru nang x hoi. ((hieu van) OR (thien van)) chao xu van hanh lam va triet.
• Adding a wildcard symbol may retrieve word variants: su sach tru nang x hoi. ((hieu van) or (thien van)) chao xu van hanh lam va triet*.