Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
van dau » van dao, phan dau
dau duc » dao duc, dang duc, dau nuoc
nang so » nang som, nang co, nang ho
tu sach » thu sach, su sach, te sach
so hoc » co hoc, mo hoc, so hoa
y nang » ky nang, ly nang, v nang
lam su » lam vu
lam so » lam son, nam so, ham so

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 y nang so hoc. hieu van dau duc va thanh ((((lam su) or (lam so))) or (lai su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang so hoc. hieu van dau duc va thanh ((((lam su) OR (lam so))) OR (lai su)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang so hoc. hieu van dau duc va thanh ((((lam su) or (lam so))) or (lai su)) triet*.