Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
san benh » sau benh, tai benh, so benh
hieu van » hieu va, thien van, lieu va
benh di » benh dai, ben di, benh da
xuc san » xuc ban, luc sang, nuoc san
van cam » van nam, van lam, van cau
lang ha » long ha
lang xa » dang xay, lang van
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de 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) OR (tu sach)) ky ((lang xa) or (lang ha)) hoi. hieu van cam xuc san benh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky ((lang xa) OR (lang ha)) hoi. hieu van cam xuc san benh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky ((lang xa) or (lang ha)) hoi. hieu van cam xuc san benh di cua tre*".