Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam thuc » lam thuoc, am thuc, nam thuc
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van lam » van nam
va hanh » van hanh, va thanh, va danh
va dan » ca dan, va dao, va dau
mai ve » mai va, moi ve, dai ve
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu van lam thuc ((va dan) or (va hanh)) mai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van lam thuc ((va dan) OR (va hanh)) mai ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu van lam thuc ((va dan) or (va hanh)) mai ve triet*.