Perhaps you should try some spelling variations:
cao nang » cao dang, cam nang, cao tang
dang xay » dang van, van xay
doi cua » hoi cua
tuc cao » thuc cao, tuc co, tuc cac
cac tuc » cac toc, cac tu, cac tac
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

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 ky ((lang xa) OR (dang xay)) hoi. hieu ve cac tuc cao nang ((doi cua) OR (dai cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang xa) OR (dang xay)) hoi. hieu ve cac tuc cao nang ((doi cua) or (dai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) OR (dang xay)) hoi. hieu ve cac tuc cao nang ((doi cua) or (dai cua)) triet*.