Perhaps you should try some spelling variations:
te sach » toc sach
dat cua » dai cua, day cua, mat cua
cac toc » cac toi, cac nuoc, cac thoi
sach ky » sac ky, sach y, sach ty
qua cac » cua cac
lang ha » long ha
lang xa » dang xay, lang van
toc ta » toc tay, toc thai
ta van » tan van, tap van, va van
ma cua » ca cua, manh cua, mang 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 ((lang xa) OR (lang ha)) hoi. hieu qua cac toc ta van ((ma cua) OR (dat cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) OR (lang ha)) hoi. hieu qua cac toc ta van ((ma cua) or (dat cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) OR (lang ha)) hoi. hieu qua cac toc ta van ((ma cua) or (dat cua)) tre*.