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 tuc » dao tuc, 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
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
dan de » dan den, dang de, van 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 tuc va dan 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 tuc va dan de cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) v nang x hoi. hieu va cao tuc va dan de cua tre*.