Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cuc ban » cua ban, cac ban, duc ban
cuu ban » cuu van, cua ban, cuu san
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
ve cam » ve cham, ve cac, va cam
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: tu sach ((y lang) OR (_ land)) xa hoi. hieu ve cam ((cuc ban) OR (cuu ban)) tinh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) or (_ land)) xa hoi. hieu ve cam ((cuc ban) or (cuu ban)) tinh vi cua tre*.