Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
cau thuc » cau truc, cuu thuc, can thuc
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau triet
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
sach ky » sac ky, sach y, sach kem
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
cu tren » tu tren, dua tren
van cau » van dau, van hau, van chat

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 (sach ty)) nang xa hoi. hieu van cau thuc va danh dien ((cu tren) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang xa hoi. hieu van cau thuc va danh dien ((cu tren) OR (cau treo))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang xa hoi. hieu van cau thuc va danh dien ((cu tren) or (cau treo))*".