Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh san
thanh hoa » thanh pho
cua viet » ca viet, cua vat, cua dieu
hieu van » hieu va, thien van, lieu va
te sach » toc sach
luc tan » luc tai, duc tan, luc tam
bao luc » bao thuc
van bao » van ban, van dao
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: te sach y nang x hoi. hieu van bao luc tan ((thanh hai) or (thanh hoa)) ((cua viet) OR (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. hieu van bao luc tan ((thanh hai) OR (thanh hoa)) ((cua viet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. hieu van bao luc tan ((thanh hai) or (thanh hoa)) ((cua viet) OR (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu van bao luc tan ((thanh hai) or (thanh hoa)) ((cua viet) OR (hoa viet))*.