Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
cua viet » ca viet, cua vat, cua dieu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ban anh » ban hanh, ban banh, ban danh
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 sach ky nang xa hoi. hieu van nam cua ban anh ve ((dua tren) or (((cua viet) OR (hoa viet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van nam cua ban anh ve ((dua tren) OR (((cua viet) OR (hoa viet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu van nam cua ban anh ve ((dua tren) or (((cua viet) OR (hoa viet))))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van nam cua ban anh ve ((dua tren) or (((cua viet) OR (hoa viet))))*.