Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
dung may » dung va, dung tai, mang may
nam xuc » cam xuc, nam thuc, nam duoc
nam qua » nam quan, nam cua, nam mua
nam xua » nam cua, nam mua, nam luat
cua tre » cua te, cuu tre, cua triet
thi lan » thi hanh, thi nang, thi lien
may hoi » may thoi, tay hoi, mai hoi
sach o » sach lo, sac o, sach y
o dung » so dung, do dung, o dong
vi cua » vai cua, di cua

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: thu sach o dung may hoi. thi lan ((((nam xuc) OR (nam xua))) OR (nam qua)) van hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: thu sach o dung may hoi. thi lan ((((nam xuc) or (nam xua))) or (nam qua)) van hanh vi cua tre*.