Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh doi » danh di, thanh doi, dung doi
doi cua » dai cua, hoi cua
truc va » thuc va, trung va
ca chat » cao chat, cac chat, va chat
sach ky » sac ky, sach y, sach ty
hieu ca » hieu cac, hieu cua, hieu va
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
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: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ca chat ((truc va) OR (thuc vat)) danh doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ca chat ((truc va) or (thuc vat)) danh doi cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ca chat ((truc va) or (thuc vat)) danh doi cua tre*.