Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hoc sach » hoc sinh, hoc cac, hoc anh
van dau » van dao, phan dau
dau xuc » dau xac, dau xua, dau nuoc
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
cua te » cua tu
5 hoi » o hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) y nang ((5 hoi) or (xa hoi)). hieu van dau xuc va thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y nang ((5 hoi) OR (xa hoi)). hieu van dau xuc va thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) y nang ((5 hoi) or (xa hoi)). hieu van dau xuc va thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) y nang ((5 hoi) or (xa hoi)). hieu van dau xuc va thanh vi cua te*.