Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
xuat ban » luat ban, xuat san, thuat ban
dua tren » dung tren
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
xua ban » cua ban, qua ban, mua ban
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
anh ve » hanh ve, anh va, anh viet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang xa hoi. hieu van nam ((xua ban) OR (xuat ban)) anh ve ((dua tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang xa hoi. hieu van nam ((xua ban) OR (xuat ban)) anh ve ((dua tren) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang xa hoi. hieu van nam ((xua ban) OR (xuat ban)) anh ve ((dua tren) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang xa hoi. hieu van nam ((xua ban) OR (xuat ban)) anh ve ((dua tren) or (cua viet))*.