Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
cau loc » hau loc, cau hoc, cau luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
loc va » hoc va, luc va
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: te sach ky ((nang x) OR (dang xay)) hoi. hieu van cau loc va hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang x) or (dang xay)) hoi. hieu van cau loc va hanh vi cua tre*.