Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc dao » thuc dan, thuc day, chuc dao
cuu tre » cau tren, cau treo
dan vai » dan va, dan tai, dan vat
dao dan » dao van, cao dang, dao dong
cua tre » cua te, cua triet, dua tren
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay

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

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