Perhaps you should try some spelling variations:
thuoc sach » hoc sach, thuat sach, thuoc sinh
nuoc sach » nguoi sach, hoc sach, cuoc cach
lang van » dang van, tang van, hoang van
nam thuc » nam thuoc, am thuc, nam thu
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam, va nay
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (nuoc sach)) ky ((lang xa) or (lang van)) hoi. hieu va nam thuc va dan va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (nuoc sach)) ky ((lang xa) OR (lang van)) hoi. hieu va nam thuc va dan va cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (nuoc sach)) ky ((lang xa) or (lang van)) hoi. hieu va nam thuc va dan va cuu tre*.