Perhaps you should try some spelling variations:
dang xay » dang van, van xay
dinh va » dinh van, dinh ve, tinh va
ma dinh » mai dinh, va dinh, ba dinh
duoc ma » duoc lam
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((lang xa) or (dang xay)) hoi. hieu ((van lam) OR (van nam)) duoc ma dinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (dang xay)) hoi. hieu ((van lam) OR (van nam)) duoc ma dinh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) or (dang xay)) hoi. hieu ((van lam) OR (van nam)) duoc ma dinh va cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (dang xay)) hoi. hieu ((van lam) OR (van nam)) duoc ma dinh va cua tre*.