Perhaps you should try some spelling variations:
thien van » thi van
mang cua » manh cua, dung cua, ban cua
dang xay » dang van, van xay
van cau » van dau, van hau, van chat
cuc ban » cua ban, cac ban, cuu ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
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: tu sach ky ((mang cua) or (dang xay)) hoi. thien van cau ((duc tan) or (cuc ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((mang cua) OR (dang xay)) hoi. thien van cau ((duc tan) OR (cuc ban)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang cua) or (dang xay)) hoi. thien van cau ((duc tan) or (cuc ban)) hanh vi cua tre*.