Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
hoi cua » hoi chuc
loi cua » loai cua, doi cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
vu sach » vu bach, vu khach
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
su sach » so sach
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: ((vu sach) or (su sach)) ty lang xa hoi. hieu va nam thuc va thanh ((loi cua) OR (hoi cua)) nuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ty lang xa hoi. hieu va nam thuc va thanh ((loi cua) OR (hoi cua)) nuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (su sach)) ty lang xa hoi. hieu va nam thuc va thanh ((loi cua) OR (hoi cua)) nuoc".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ty lang xa hoi. hieu va nam thuc va thanh ((loi cua) OR (hoi cua)) nuoc*.