Perhaps you should try some spelling variations:
lang hoa » hang hoa, lang ha, nang hoa
nam thuc » nam thuoc, am thuc, nam thu
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach ty, sach kem
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu ve » hieu va, hieu van
hanh ve » hanh vi, hanh va
ve nam » he nam, va nam, le nam
kem » kiem

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) or (sach y)) lang hoa hoi. hieu ve nam thuc vat ((hanh ve) OR (hanh kem)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) lang hoa hoi. hieu ve nam thuc vat ((hanh ve) OR (hanh kem)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) lang hoa hoi. hieu ve nam thuc vat ((hanh ve) OR (hanh kem)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) lang hoa hoi. hieu ve nam thuc vat ((hanh ve) OR (hanh kem)) su triet*.