Perhaps you should try some spelling variations:
danh sai » dung sai, danh bat, danh dau
te sach » toc sach
sai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cac duc » cao duc, cac dac, cac nuoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
lang ha » long ha
cua tre » cua te, cuu tre, cua triet

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 y ((nang xa) OR (lang ha)) hoi. hieu va ((cac duc) OR (cac du)) va danh sai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (lang ha)) hoi. hieu va ((cac duc) OR (cac du)) va danh sai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (lang ha)) hoi. hieu va ((cac duc) OR (cac du)) va danh sai cua tre*.