Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
cay tren » chay tren, ca tren, cau tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang co » nang doc, nang noi, nang hoc
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
dan cua » dan ca, ban cua, dai cua
cua cay » cua cac
ve cam » ve cham, ve cac, va cam
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang co) or (nang cao)) hoi. hieu ve cam thuc va dan cua cay tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang co) OR (nang cao)) hoi. hieu ve cam thuc va dan cua cay tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang co) or (nang cao)) hoi. hieu ve cam thuc va dan cua cay tren*.