Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
te sach » toc sach
hang di » hang doi, hang vi, hang dien
va hang » van hang, va nang, va lang
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
ve cam » ve cham, ve cac, va cam
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (do sanh)) ky ((lang xa) or (nang ma)) hoi. hieu ve cam thuc va hang di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (do sanh)) ky ((lang xa) OR (nang ma)) hoi. hieu ve cam thuc va hang di cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (do sanh)) ky ((lang xa) or (nang ma)) hoi. hieu ve cam thuc va hang di cuu tre*.