Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
su triet » su viet, ve triet
hang dan » hang dau, hang ban, tang dan
van hang » van khang, van hoang, van thang
thuc van » thuc vat, thuc dan, thuc va
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
su tien » su kien, su hien, tu tieng
ve nam » he nam, va nam, le nam

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) or (sach y)) lang xa hoi. hieu ve nam thuc van hang dan ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) lang xa hoi. hieu ve nam thuc van hang dan ((su triet) OR (su tien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) lang xa hoi. hieu ve nam thuc van hang dan ((su triet) OR (su tien))*".