Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
cua viet » hoa viet, cua vat, cua dieu
tu sach » thu sach, su sach, te sach
van bao » van ban, van dao
luc tan » luc tai, luc tam, luc van
ca viet » va viet, co viet, hoa viet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu van bao ((luc tan) or (duc tan)) thanh hai ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu van bao ((luc tan) OR (duc tan)) thanh hai ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu van bao ((luc tan) or (duc tan)) thanh hai ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu van bao ((luc tan) or (duc tan)) thanh hai ((cua viet) OR (ca viet))*.