Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, ban hanh
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, dia danh
cua su » qua su
y nang » ky nang, ly nang, v nang

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 xa hoi. hieu van ((lam duoc) or (am thuc)) ((va danh) OR (va hanh)) vai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu van ((lam duoc) OR (am thuc)) ((va danh) OR (va hanh)) vai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu van ((lam duoc) or (am thuc)) ((va danh) OR (va hanh)) vai cua su".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van ((lam duoc) or (am thuc)) ((va danh) OR (va hanh)) vai cua su*.