Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
benh vi » benh va, benh ve, benh li
bo benh » so benh, o benh, ba benh
sach ky » sac ky, sach y, sach ty
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cuu tre » cau tren, cau treo
duc bo » duc bao, duc mo, duc so

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu van cam duc bo benh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu van cam duc bo benh vi ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (lang xa)) hoi. hieu van cam duc bo benh vi ((cua tre) or (cuu tre))*".