Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
nam thuc » nam thuoc, am thuc, nam tu
hang hoa » hang khoa, thanh hoa, hang va
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
ky hang » ky nang, ly hang, ky dang
va hanh » va thanh, va danh, ban hanh
te sach » toc sach

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 hang hoa hoi. hieu ve ((nam thuc) or (nam thu)) ((van hanh) or (va hanh)) va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky hang hoa hoi. hieu ve ((nam thuc) OR (nam thu)) ((van hanh) OR (va hanh)) va su triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky hang hoa hoi. hieu ve ((nam thuc) or (nam thu)) ((van hanh) or (va hanh)) va su triet*.