Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dieu cua » dieu tra
hieu va » lieu va, hieu qua
va cao » va cac, va co, va dao
luc va » duc va, loc va
sach v » sach va, sach y, sach 2
tuc va » thuc va, truc va, tuc xa
de cua » le cua, te cua
v nang » va nang, vu nang, van nang
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: thuoc sach v nang x hoi. hieu va cao ((luc va) or (tuc va)) dan ((de cua) OR (dieu cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach v nang x hoi. hieu va cao ((luc va) OR (tuc va)) dan ((de cua) OR (dieu cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach v nang x hoi. hieu va cao ((luc va) or (tuc va)) dan ((de cua) OR (dieu cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach v nang x hoi. hieu va cao ((luc va) or (tuc va)) dan ((de cua) OR (dieu cua)) tre*.