Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
cuu tre » cua tre, cau tren, cau treo
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu van
y nang » ky nang, ly nang, v nang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu

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 y nang mai hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) OR (tuc va)) danh vi cuu tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang mai hoi. ((hieu ve) or (hieu va)) cam ((xuc va) or (tuc va)) danh vi cuu tre*.