Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hieu viec » nhieu viec, hieu ve, sieu viet
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
viec cac » vien cac, viec cua, viec lam
hoc sach » hoc sinh, hoc cac, hoc anh
va triet » va thiet, va trien, ve triet
ty nang » ky nang, ty xang, ty hang
cac tac » cac toc, cac bac, cac dac
tac va » tac da, tac xa, tuc va
x hoi » o hoi, x ho, 5 hoi
ve va » ve van, te va, ke 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) OR (hoc sach)) ty nang ((x hoi) or (xa hoi)). hieu viec cac tac va thanh ve va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) ty nang ((x hoi) OR (xa hoi)). hieu viec cac tac va thanh ve va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (hoc sach)) ty nang ((x hoi) or (xa hoi)). hieu viec cac tac va thanh ve va triet".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (hoc sach)) ty nang ((x hoi) or (xa hoi)). hieu viec cac tac va thanh ve va triet*.