Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
hang ca » hang va, hang tai, hang dau
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh ki » hanh vi, hanh ky, hanh kien
su tien » su kien, su hien, tu tieng
ve nam » he nam, va nam, le nam
ki su » ky su

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 ly ((hang ca) or (nang cao)) hoi. hieu ve nam thuc va hanh ki su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly ((hang ca) OR (nang cao)) hoi. hieu ve nam thuc va hanh ki su tien.
• Adding a wildcard symbol may retrieve word variants: tu sach ly ((hang ca) or (nang cao)) hoi. hieu ve nam thuc va hanh ki su tien*.