Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
tru nang » tra nang, tri nang, thi nang
so sach » so sanh, bo sach, co sach
tuc ban » thuc ban, truc ban, tu ban
cam tuc » cam xuc, cam tu, nam thuc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((tru nang) OR (truc nano)) ma hoi. hieu ve cam tuc ban thanh hai ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((tru nang) OR (truc nano)) ma hoi. hieu ve cam tuc ban thanh hai ((cua te) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((tru nang) OR (truc nano)) ma hoi. hieu ve cam tuc ban thanh hai ((cua te) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sach ((tru nang) OR (truc nano)) ma hoi. hieu ve cam tuc ban thanh hai ((cua te) or (cuu tre))*.