Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
su sach » vu sach
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
so sach » so sanh, bo sach, co sach
va chao » va cao, va chat, va cham
xu van » tu van, vu van, su van
lam va » nam va, dam va, am va
lam ha » nam ha, dam ha, lam chat

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty hang xa hoi. hieu va chao xu van hanh ((lam va) OR (lam ha)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty hang xa hoi. hieu va chao xu van hanh ((lam va) or (lam ha)) triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty hang xa hoi. hieu va chao xu van hanh ((lam va) or (lam ha)) triet*.