Perhaps you should try some spelling variations:
sach nay » sach hay, sach vay, sach nang
nam thuc » nam thuoc, am thuc, nam thu
sach tay » xach tay, sach hay, sach tai
vai cuu » vai cua
dan vai » dan va, dan tai, dan vat
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam, va nay
ha hoi » hoa hoi, ha noi, va hoi
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach tay) OR (sach nay)) lang ((ha hoi) or (xa hoi)). hieu va nam thuc va dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tay) OR (sach nay)) lang ((ha hoi) OR (xa hoi)). hieu va nam thuc va dan vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach tay) OR (sach nay)) lang ((ha hoi) or (xa hoi)). hieu va nam thuc va dan vai cuu tre*".