Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
lam thuc » lam thuoc, am thuc, nam thuc
phu lang » phap lang, phu khang, phu luong
dinh lai » dinh lam, dinh lap, dinh tai
cay phoi » cap phoi, tay hoi, cay cho
sach phu » sach thu, sach phat, sach thue
cua tre » cua te, cua triet, dua tren
va dinh » van dinh, va kinh, va tinh
cuu tre » cau tren, cau treo
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, gay thoi
va lam » van lam, va lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach phu lang ((xay hoi) or (cay phoi)). hieu va lam thuc va dinh lai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach phu lang ((xay hoi) OR (cay phoi)). hieu va lam thuc va dinh lai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach phu lang ((xay hoi) or (cay phoi)). hieu va lam thuc va dinh lai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach phu lang ((xay hoi) or (cay phoi)). hieu va lam thuc va dinh lai ((cua tre) OR (cuu tre))*.