Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh duc » thach duc, than duc, thinh duc
hieu van » hieu va, thien van, lieu va
van hanh » ban hanh, van anh, van ban
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va hanh » va thanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai cua
sach 2 » sach y
2 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 2 nang xa hoi. hieu van thanh duc ((va hanh) OR (van hanh)) ((vai cua) or (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 nang xa hoi. hieu van thanh duc ((va hanh) OR (van hanh)) ((vai cua) OR (thai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach 2 nang xa hoi. hieu van thanh duc ((va hanh) OR (van hanh)) ((vai cua) or (thai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach 2 nang xa hoi. hieu van thanh duc ((va hanh) OR (van hanh)) ((vai cua) or (thai cua)) tre*.