Perhaps you should try some spelling variations:
lang hoa » hang hoa, lang ha, nang hoa
nam thuc » nam thuoc, am thuc, nam tu
su triet » su viet, su tien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu ve » hieu va, hieu van
hanh ve » hanh vi, hanh va
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: te sach ky lang hoa hoi. hieu ve ((nam thuc) or (nam thu)) vat ((hanh ve) OR (hanh kem)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang hoa hoi. hieu ve ((nam thuc) OR (nam thu)) vat ((hanh ve) OR (hanh kem)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang hoa hoi. hieu ve ((nam thuc) or (nam thu)) vat ((hanh ve) OR (hanh kem)) su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang hoa hoi. hieu ve ((nam thuc) or (nam thu)) vat ((hanh ve) OR (hanh kem)) su triet*.