Perhaps you should try some spelling variations:
toc sach » thuoc sach, nuoc sach, toc san
doc sach » nuoc sach, dac sac, bo sach
hoc sach » hoc sinh, hoc cac, hoc anh
dinh lam » dinh van, tinh lao
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
va dinh » van dinh, va kinh, va tinh
lam cua » nam cua, lam chat
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
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: ((((toc sach) OR (doc sach))) or (hoc sach)) ky nang x hoi. hieu va cac xuc va dinh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((toc sach) OR (doc sach))) OR (hoc sach)) ky nang x hoi. hieu va cac xuc va dinh lam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((toc sach) OR (doc sach))) or (hoc sach)) ky nang x hoi. hieu va cac xuc va dinh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: ((((toc sach) OR (doc sach))) or (hoc sach)) ky nang x hoi. hieu va cac xuc va dinh lam cua tre*.