Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vai cuu » vai cua
dan vai » dan va, dan tai, dan vat
thuc va » thuc vat, thuc dan, thuc day
sach ky » sach y, sach ty, sach kem
hieu va » hieu qua
long ha » dong ha, cong ha, dong hoa
cuu tre » cua tre, cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi
sac ky » cac ky, sai ky
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 ky) OR (sac ky)) long ha hoi. ((hieu va) or (lieu va)) nam thuc va dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sac ky)) long ha hoi. ((hieu va) OR (lieu va)) nam thuc va dan vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) OR (sac ky)) long ha hoi. ((hieu va) or (lieu va)) nam thuc va dan vai cuu tre*".