Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
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 cau 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 cau duc va thanh ((((lam su) OR (lam so))) OR (lai su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang so hoc. hieu van cau 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 cau duc va thanh ((((lam su) OR (lam so))) or (lai su)) triet*.