Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
ban nuoc » ban duoc, ban nuoi, ban thuoc
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
va tinh » may tinh
ca viet » va viet, co viet, hoa viet
y nang » ky nang, ly nang, v nang
vit ca » viet ca, viet cau

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 ban nuoc ((va danh) OR (((ban thanh) OR (va tinh)))) vit ca viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu van ban nuoc ((va danh) OR (((ban thanh) OR (va tinh)))) vit ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van ban nuoc ((va danh) OR (((ban thanh) OR (va tinh)))) vit ca viet*.