Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
xay hoi » xa hoi, tay hoi, cay phoi
thi van » thi lan, thi hanh, thi nang
nam xuc » cam xuc, nam thuc, nam duoc
nam xua » nam cua, nam mua, nam qua
cua tre » cua te, cuu tre, cua triet
sach o » sach lo, sac o, sach y
o dang » xo dang, do dang, so dang
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach o dang xay hoi. thi van ((nam xuc) or (nam xua)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach o dang xay hoi. thi van ((nam xuc) OR (nam xua)) van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach o dang xay hoi. thi van ((nam xuc) or (nam xua)) van hanh vi cua tre*.