Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
lang di » lang dai, hang di, lang du
va lang » va nang, hoa lang
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
v nang » va nang, vu nang, van nang
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua
va cao » va co, va dao, va bao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) v nang xa hoi. hieu ((va cao) OR (va cac)) luc va lang di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc sach)) v nang xa hoi. hieu ((va cao) OR (va cac)) luc va lang di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) v nang xa hoi. hieu ((va cao) OR (va cac)) luc va lang di cua tre*.