Perhaps you should try some spelling variations:
ban benh » san benh, ba benh, ban banh
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
benh da » benh dai, benh va, benh do
cau luc » cau truc, cau phuc
cau xuc » cam xuc, cau truc, chat xuc
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
da cua » dai cua, day cua, dan 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 ky) or (sac ky)) nang xa hoi. hieu van ((cau xuc) OR (cau luc)) ban benh da cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang xa hoi. hieu van ((cau xuc) OR (cau luc)) ban benh da cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sac ky)) nang xa hoi. hieu van ((cau xuc) OR (cau luc)) ban benh da cua tre*".