Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
lam thuc » lam thuoc, am thuc, nam thuc
tu sach » thu sach, su sach, te sach
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
vi cua » vai cua, di cua

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

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