Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
va thanh » gia thanh, ban thanh, va tinh
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va cao » va cac, va co, va dao
xuc va » duc va, tuc va, luc va
v nang » va nang, vu nang, van nang
va cam » va cham, va cac, va cai

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