Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
va thanh » gia thanh, ban thanh, va tinh
cac tac » cac toc, cac bac, cac dac
ty hang » ty xang, thi hang, thu hang
ly hang » ly quang
tac va » tac da, tac xa, tuc va
ve van » le van
x hoi » xa hoi, o hoi, x ho
ve va » te va, ke va, le va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((ty hang) OR (ly hang)) x hoi. hieu viec cac tac va thanh ((ve va) or (ve van)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ty hang) OR (ly hang)) x hoi. hieu viec cac tac va thanh ((ve va) OR (ve van)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ty hang) OR (ly hang)) x hoi. hieu viec cac tac va thanh ((ve va) or (ve van)) triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ty hang) OR (ly hang)) x hoi. hieu viec cac tac va thanh ((ve va) or (ve van)) triet*.