Perhaps you should try some spelling variations:
te sach » toc sach
danh ca » dan ca, doanh cua, danh cho
va danh » va dinh, va dan, va hanh
cac dac » cac dan, cac dai, cac bac
cac duc » cac du, cao duc, cac nuoc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
mang xa » lang xa, mang may, dang xay
cua tre » cua te, cuu tre, cua triet
ca cua » co 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 ((mang xa) or (tang ma)) hoi. hieu va ((cac duc) OR (cac dac)) va danh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((mang xa) OR (tang ma)) hoi. hieu va ((cac duc) OR (cac dac)) va danh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((mang xa) or (tang ma)) hoi. hieu va ((cac duc) OR (cac dac)) va danh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((mang xa) or (tang ma)) hoi. hieu va ((cac duc) OR (cac dac)) va danh ca cua tre*.