Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ban benh » san benh, ba benh, ban banh
benh de » benh ve, benh he, menh de
cau xuc » cam xuc, cau luc, chat xuc
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang xa) OR (lang xa)) hoi. hieu van ((cau xuc) or (cau truc)) ban benh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (lang xa)) hoi. hieu van ((cau xuc) OR (cau truc)) ban benh de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) OR (lang xa)) hoi. hieu van ((cau xuc) or (cau truc)) ban benh de cua tre*".