Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
hieu va » lieu va, hieu qua
cao luc » bao luc, cao duc, cao suc
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
va dau » va dao
dau de » dau ve, dai de, sau de
de cua » le cua, te cua, dieu cua
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) or (thuat sach)) v nang x hoi. hieu va cao luc va dau de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat sach)) v nang x hoi. hieu va cao luc va dau de cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) v nang x hoi. hieu va cao luc va dau de cua tre*.