Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
va chat » van chat, va phat, cao chat
vat dao » va dao, van dao, vat da
dao dai » dat dai, dao dan, tao dai
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 ty ((nang xa) OR (nang ma)) hoi. hieu ((va chat) OR (vo co)) thuc vat dao dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang xa) OR (nang ma)) hoi. hieu ((va chat) or (vo co)) thuc vat dao dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) OR (nang ma)) hoi. hieu ((va chat) or (vo co)) thuc vat dao dai cua tre*.