Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va thanh » gia thanh, ban thanh, va tinh
vien cac » vien dai, vien da, gian cac
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
tac va » tac da, tac xa, tuc va
x hoi » xa hoi, o hoi, x ho
ve va » ve van, te va, le va
ke va » te 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 nang x hoi. hieu ((vien cac) OR (vien bach)) tac va thanh ((ve va) or (ke va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty nang x hoi. hieu ((vien cac) OR (vien bach)) tac va thanh ((ve va) OR (ke va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ty nang x hoi. hieu ((vien cac) OR (vien bach)) tac va thanh ((ve va) or (ke va)) triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty nang x hoi. hieu ((vien cac) OR (vien bach)) tac va thanh ((ve va) or (ke va)) triet*.